Business Combinations [Abstract] Business Combination Disclosure [Text Block] Business Combination Disclosure [Text Block] Valuation and Qualifying Accounts [Abstract] Allowance for doubtful accounts receivable Allowance for Doubtful Accounts Receivable Valuation Allowances and Reserves, Adjustments Valuation Allowances and Reserves, Adjustments Valuation Allowances and Reserves, Deductions Valuation Allowances and Reserves, Deductions Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Accounting Policies [Abstract] Fiscal Year Fiscal Period, Policy [Policy Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Estimates Use of Estimates, Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Shipping and Handling Shipping and Handling Cost, Policy [Policy Text Block] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Investments Investment, Policy [Policy Text Block] Trade Receivables Trade and Other Accounts Receivable, Policy [Policy Text Block] Inventories Inventory, Policy [Policy Text Block] Property, Plant and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Goodwill and Identifiable Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Stock-Based Compensation Compensation Related Costs, Policy [Policy Text Block] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Derivatives Instruments and Hedging Activities Derivatives, Policy [Policy Text Block] Inventory Disclosure [Abstract] Inventories (Textual) [Abstract] Inventories (Textual) [Abstract] Inventories. Finished goods (LIFO basis) LIFO Inventory Amount Increase (Decrease) LIFO reserve Inventory, LIFO Reserve, Period Charge Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Land [Member] Land [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] Litigation Status [Axis] Litigation Status [Axis] Litigation Status [Domain] Litigation Status [Domain] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Number of Leases Number of Leases Number of Leases Minimum rentals Operating Leases, Rent Expense, Minimum Rentals Contingent rentals Operating Leases, Rent Expense, Contingent Rentals Total rental expense Operating Leases, Rent Expense, Net Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer Relationships [Member] Customer Relationships [Member] Noncompete Agreements [Member] Noncompete Agreements [Member] Order or Production Backlog [Member] Order or Production Backlog [Member] Trade Names [Member] Trade Names [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Davis Supply Inc. [Member] Davis Supply Inc. [Member] Davis Supply Inc. [Member] Stauber Performance Ingredients [Member] Stauber Performance Ingredients [Member] Stauber Performance Ingredients [Member] The Dumont Company, Inc [Member] The Dumont Company, Inc [Member] The Dumont Company, Inc [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Cash Acquired from Acquisition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Accounts receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Inventory Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory Other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other Property, plant, and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Accounts payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable Accrued expenses and other current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other Deferred income taxes Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent Other non-current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Net assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Goodwill Goodwill Total preliminary purchase price Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Less acquired cash Less Acquired Cash Less Acquired Cash Total purchase price Payments to Acquire Businesses, Net of Cash Acquired Restricted Cash and Cash Equivalents Restricted Cash and Cash Equivalents Income Tax Receivable, Business Combinations Income Tax Receivable, Business Combinations Income tax receivable related to pre-acquistition income taxes Income Tax Payable, Business Combinations Income Tax Payable, Business Combinations Income tax payable to sellers related to pre-acquisition income taxes Quarterly Financial Information Disclosure [Abstract] Selected Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Inventories Inventory Disclosure [Text Block] Statement [Table] Statement [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Maximum [Member] Maximum [Member] Minimum [Member] Minimum [Member] Statement [Line Items] Statement [Line Items] Number of reportable segments (segment) Number of Reportable Segments Number of Weeks in Fiscal Year Number of Weeks in Fiscal Year Number of Weeks in Fiscal Year Number of weeks in next fiscal year Number of Weeks in Next Fiscal Year Number of Weeks in Next Fiscal Year Percentage of LIFO Inventory Percentage of LIFO Inventory Percentage of FIFO inventory Percentage of FIFO Inventory Weighted-average common shares outstanding-basic (shares) Weighted Average Number of Shares Outstanding, Basic Dilutive impact of stock options, performance units, and restricted stock (shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Weighted average common shares outstanding — diluted (shares) Weighted Average Number of Shares Outstanding, Diluted Weighted average number diluted shares outstanding adjustment Weighted Average Number Diluted Shares Outstanding Adjustment Income Tax Disclosure [Abstract] Income Tax Contingency [Table] Income Tax Contingency [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Domain] Income Tax Authority, Name [Domain] Tax Period [Axis] Tax Period [Axis] Tax Period [Domain] Tax Period [Domain] Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Unrecognized Tax Benefits Unrecognized Tax Benefits Business Combination, Indemnification Assets, Amount as of Acquisition Date Business Combination, Indemnification Assets, Amount as of Acquisition Date Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Tax Adjustments, Settlements, and Unusual Provisions Tax Adjustments, Settlements, and Unusual Provisions Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Net Income (Loss) Attributable to Parent Reconciliation to cash flows: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Amortization of debt issuance costs Amortization of Financing Costs Loss on disposal of investments Gain (Loss) on Sale of Investments Deferred income taxes Deferred Income Tax Expense (Benefit) Share-based compensation expense Share-based Compensation (Gain) loss from property disposals Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Changes in operating accounts (using) providing cash, net of effects of acquisition: Increase (Decrease) in Operating Capital [Abstract] Trade receivables Increase (Decrease) in Accounts Receivable Inventories Increase (Decrease) in Inventories Accounts payable Increase (Decrease) in Accounts Payable Accrued liabilities Increase (Decrease) in Accrued Liabilities Income taxes Increase (Decrease) in Income Taxes Payable Other Increase (Decrease) in Other Operating Assets and Liabilities, Net Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Additions to property, plant, and equipment Payments to Acquire Property, Plant, and Equipment Purchases of investments Payments to Acquire Investments Sale and maturities of investments Proceeds from Sale and Maturity of Marketable Securities Proceeds from property disposals Proceeds from Sale of Property, Plant, and Equipment Acquisitions, net of cash acquired Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Cash dividends paid Payments of Ordinary Dividends, Common Stock New shares issued Proceeds from Issuance of Common Stock Stock options exercised Proceeds from Stock Options Exercised Excess tax benefit from share-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options Shares surrendered for payroll taxes Shares Surrendured for Payroll Taxes Shares surrendured for payroll taxes Shares repurchased Payments for Repurchase of Equity Payments on senior secured term loan Repayments of Debt Payments on senior secured revolving credit facility Repayments of Other Long-term Debt Payments for debt issuance costs Payments of Debt Issuance Costs Proceeds from long-term borrowings Proceeds from Debt, Maturing in More than Three Months Proceeds from revolver borrowings Proceeds from Long-term Lines of Credit Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS Cash and Cash Equivalents, Period Increase (Decrease) CASH AND CASH EQUIVALENTS - beginning of year Cash and Cash Equivalents, at Carrying Value CASH AND CASH EQUIVALENTS - end of year SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION- Supplemental Cash Flow Information [Abstract] Cash paid during the year for income taxes Income Taxes Paid, Net Cash paid for interest Interest Paid Noncash investing activities - Capital expenditures in accounts payable Capital Expenditures Incurred but Not yet Paid Acquisition consideration accrued but not paid Payments for Previous Acquisition Compensation and Retirement Disclosure [Abstract] Number of Collective Bargaining Agreements Number of Collective Bargaining Agreements Number of collective bargaining agreements. Multi Employer Pension Plan Withdrawal Liability Payment Over Period of Years Multi Employer Pension Plan Withdrawal Liability Payment Over Period of Years Multi employer pension plan withdrawal liability payment over period of years. Multiemployer Pension Plan Withdrawal Aggregate Cash Payment Multiemployer Pension Plan Withdrawal Aggregate Cash Payment Multiemployer pension plan withdrawal aggregate cash payment. Multiemployer pension plan withdrawal aggregate cash payment per year Multiemployer Pension Plan Withdrawal Aggregate Cash Payment per Year Multiemployer pension plan withdrawal aggregate cash payment per year. Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative Instruments and Hedging Activities Disclosure [Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Statement of Stockholders' Equity [Abstract] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) [Member] AOCI Attributable to Parent [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Shares outstanding, beginning balance Shares, Issued Stockholders' equity, beginning balance Stockholders' Equity Attributable to Parent Cash dividends declared Dividends, Common Stock, Cash Share-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Tax benefit on share-based compensation plans Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net Vesting of restricted stock (shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Vesting of restricted stock Stock Issued During Period, Value, Restricted Stock Award, Gross Shares surrendered for payroll taxes (shares) Shares Surrendered During Period, For Payroll Taxes, Shares Shares Surrendered During Period, For Payroll Taxes, Shares Shares surrendered for payroll taxes Shares Surrendered During Period, For Payroll Taxes, Value Shares Surrendered During Period, For Payroll Taxes, Value Stock options exercised (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Stock options exercised Stock Issued During Period, Value, Stock Options Exercised ESPP shares issued (shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans ESPP shares issued Stock Issued During Period, Value, Employee Stock Purchase Plan Shares repurchased (Shares) Stock Repurchased During Period, Shares Other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Net income Shares outstanding, ending balance Stockholders' equity, ending balance Statutory federal income tax (percent) Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent State income taxes, net of federal deduction (percent) Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent ESOP dividend deduction on allocated shares (percent) Effective Income Tax Rate Reconciliation, Deduction, Employee Stock Ownership Plan Dividend, Percent Domestic production deduction (percent) Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent Non-deductible acquisition costs (percent) Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Assessment related to state tax audit (percent) Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Percent Other — net (percent) Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Total (percent) Effective Income Tax Rate Reconciliation, Percent Share Repurchase Program [Abstract] Share Repurchase Program [Abstract] Stock Repurchase Program, Number of Shares Authorized to be Repurchased Stock Repurchase Program, Number of Shares Authorized to be Repurchased Stock Repurchased During Period, Shares Stock Repurchased During Period, Value Stock Repurchased During Period, Value Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased Stockholders' Equity Note Disclosure [Text Block] Stockholders' Equity Note Disclosure [Text Block] Goodwill Goodwill, Period Increase (Decrease) Goodwill, Period Increase (Decrease) Intangible assets amortization expense Amortization of Intangible Assets Schedule of earnings per share, basic and diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of contribution expenses Schedule of Costs of Retirement Plans [Table Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Performance-Based Restricted Stock [Member] Performance Shares [Member] Restricted Stock Awards [Member] Restricted Stock [Member] Stock Options [Member] Employee Stock Option [Member] Weighted Average [Member] Weighted Average [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Range of restricted stock to be issued minimum Range of Restricted Stock to be Issued Minimum Range of restricted stock to be issued minimum. Range of restricted stock to be issued maximum Range of Restricted Stock to be Issued Maximum Range of restricted stock to be issued maximum. Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Weighted average grant date fair value (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Compensation expense Allocated Share-based Compensation Expense Equity instruments other than options, vested in period, total fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Cost not yet recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Cost not yet recognized, period for recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Income Statement [Abstract] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Sales Revenue, Net Cost of sales Cost of Goods and Services Sold Gross profit Gross Profit Selling, general and administrative expenses Selling, General and Administrative Expense Operating income Operating Income (Loss) Interest (expense) income, net Interest Income (Expense), Net Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax provision Income Tax Expense (Benefit), Continuing Operations, Total The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to pretax income or loss from continuing operations. Net income Weighted average number of shares outstanding-basic Weighted average number of shares outstanding-diluted Basic earnings per share: Earnings Per Share, Basic [Abstract] Basic earnings per share Earnings Per Share, Basic Diluted earnings per share Earnings Per Share, Diluted [Abstract] Diluted earnings per share Earnings Per Share, Diluted Cash dividends declared per common share Common Stock, Dividends, Per Share, Declared Statement of Financial Position [Abstract] ASSETS Assets [Abstract] CURRENT ASSETS: Assets, Current [Abstract] Cash and cash equivalents Trade receivables, less allowance for doubtful accounts of $468 for 2017 and $602 for 2016 Accounts Receivable, Net, Current Inventories Inventory, Net Income taxes receivable Income Taxes Receivable, Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current PROPERTY, PLANT, AND EQUIPMENT: Property, Plant and Equipment [Abstract] Land Land Buildings and improvements Buildings and Improvements, Gross Machinery and equipment Machinery and Equipment, Gross Transportation equipment Transportation Equipment Transportation equipment Office furniture and equipment including computer systems Furniture and Fixtures, Gross Property, plant and equipment, gross Property, Plant and Equipment, Gross Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Net property, plant, and equipment Property, Plant and Equipment, Net OTHER ASSETS: Other Assets [Abstract] Goodwill Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Other Other Assets, Noncurrent Total other assets Other Assets Total assets Assets LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] CURRENT LIABILITIES: Liabilities, Current [Abstract] Accounts payable — trade Accounts Payable, Current Dividends payable Dividends Payable, Current Accrued payroll and employee benefits Employee-related Liabilities, Current Current portion of long-term debt Long-term Debt, Current Maturities Due to sellers of acquired business Other Deferred Compensation Arrangements, Liability, Current Container deposits Customer Deposits, Current Other current liabilities Other Accrued Liabilities, Current Total current liabilities Liabilities, Current LONG-TERM DEBT, LESS CURRENT PORTION Long-term Debt, Excluding Current Maturities PENSION WITHDRAWAL LIABILITY Defined Benefit Pension Plan, Liabilities, Noncurrent OTHER LONG-TERM LIABILITIES Other Liabilities, Noncurrent DEFERRED INCOME TAXES Deferred Tax Liabilities, Net, Noncurrent Total liabilities Liabilities COMMITMENTS AND CONTINGENCIES Commitments and Contingencies SHAREHOLDERS’ EQUITY: Stockholders' Equity Attributable to Parent [Abstract] Common stock; authorized: 30,000,000 shares of $0.05 par value; 10,582,596 and 10,512,471 shares issued and outstanding for 2017 and 2016, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Total shareholders’ equity Total liabilities and shareholders’ equity Liabilities and Equity Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Beginning Balance, Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted, Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested, Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited or expired, Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Ending Balance, Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Beginning Balance, Weighted average grant date fair value (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted, Weighted average grant date fair value (usd per share) Vested, Weighted average grant date fair value (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited or expired, Weighted average grant date fair value (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Ending Balance, Weighted average grant date fair value (usd per share) Estimated amortization expense [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] 2018 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Five Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2018 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2019 Operating Leases, Future Minimum Payments, Due in Two Years 2020 Operating Leases, Future Minimum Payments, Due in Three Years 2021 Operating Leases, Future Minimum Payments, Due in Four Years 2022 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Schedule of quarterly financial information (Unaudited) Schedule of Quarterly Financial Information [Table Text Block] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Building and Building Improvements [Member] Building and Building Improvements [Member] Machinery and Equipment [Member] Machinery and Equipment [Member] Transportation Equipment [Member] Transportation Equipment [Member] Office Equipment [Member] Office Equipment [Member] Average [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property, plant and equipment, estimated useful lives Property, Plant and Equipment, Useful Life Finite-lived intangible asset, useful life Finite-Lived Intangible Asset, Useful Life Share-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Maturities of Long-term Debt Schedule of Maturities of Long-term Debt [Table Text Block] Segment Reporting [Abstract] Summary of Segment Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Common stock, shares authorized (shares) Common Stock, Shares Authorized Common stock, par value (usd per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued (shares) Common Stock, Shares, Issued Common stock, shares outstanding (shares) Common Stock, Shares, Outstanding Schedule of goodwill Schedule of Goodwill [Table Text Block] Summary of intangible assets Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Schedule of future amortization expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Segment Information Segment Reporting Disclosure [Text Block] Document and Entity Information [Abstract] Document and entity information. Document Type Document Type Document Period End Date Document Period End Date Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Profit Sharing, Employee Stock Ownership Plan, Employee Stock Purchase Plan and Defined Contribution Pension Plan Contribution Expense Pension and Other Postretirement Benefits Disclosure [Text Block] Derivative [Table] Derivative [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest Rate Swap [Member] Interest Rate Swap [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Debt Instrument, Redemption, Period One [Member] Debt Instrument, Redemption, Period One [Member] Debt Instrument, Redemption, Period Two [Member] Debt Instrument, Redemption, Period Two [Member] Debt Instrument, Redemption, Period Three [Member] Debt Instrument, Redemption, Period Three [Member] Energy [Axis] Energy [Axis] Energy [Domain] Energy [Domain] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Derivative, by Nature [Axis] Derivative, by Nature [Axis] Derivative, Name [Domain] Derivative, Name [Domain] Position [Axis] Position [Axis] Position [Domain] Position [Domain] Derivative [Line Items] Derivative [Line Items] Derivative, Notional Amount Derivative, Notional Amount Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion Cash Flow Hedge Derivative Instrument Assets at Fair Value Cash Flow Hedge Derivative Instrument Assets at Fair Value Summary of Inventories Inventory, Net [Abstract] Inventory (FIFO basis) Inventory, Finished Goods, Gross LIFO reserve Inventory, LIFO Reserve Net inventory Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Term Loan [Member] Term Loan [Member] Term Loan [Member] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Total long-term Debt Long-term Debt Unamortized Debt Issuance Expense Unamortized Debt Issuance Expense Total debt, net of debt issuance costs Total debt, net of debt issuance costs Total debt, net of debt issuance costs Less Current Portion of Long-term Debt Long-term Debt, Excluding Current Maturities Long-term Debt, Maturities, Repayments of Principal in Year Two Long-term Debt, Maturities, Repayments of Principal in Year Two Long-term Debt, Maturities, Repayments of Principal in Year Three Long-term Debt, Maturities, Repayments of Principal in Year Three Long-term Debt, Maturities, Repayments of Principal in Year Four Long-term Debt, Maturities, Repayments of Principal in Year Four Long-term Debt, Maturities, Repayments of Principal in Year Five Long-term Debt, Maturities, Repayments of Principal in Year Five Income Tax Examination [Table] Income Tax Examination [Table] Income Tax Examination [Line Items] Income Tax Examination [Line Items] Federal — current Current Federal Tax Expense (Benefit) State — current Current State and Local Tax Expense (Benefit) Total current Current Income Tax Expense (Benefit) Federal — deferred Deferred Federal Income Tax Expense (Benefit) State — deferred Deferred State and Local Income Tax Expense (Benefit) Total deferred Deferred Income Tax Expense (Benefit), Excluding Provisional Gain Deferred Income Tax Expense (Benefit), Excluding Provisional Gain Total provision Income Tax Expense (Benefit) Schedule of provisions for income taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of effective income tax rate reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of deferred tax assets and liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Health and Nutrition [Member] Health and Nutrition [Member] Health and Nutrition [Member] Industrial [Member] Industrial [Member] Industrial. Water Treatment [Member] Water Treatment [Member] Water treatment. Scenario, Actual [Member] Scenario, Actual [Member] Scenario, Plan [Member] Scenario, Plan [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Business Combination, Acquisition Related Costs Business Combination, Acquisition Related Costs Number of customers representing 10% or more of revenue (customers) Entity Wide Revenue Major Customer Number of Customers Entity wide revenue major customer number of customers. Corporate expenses allocated to segments Corporate expenses allocated to segments Corporate expenses allocated to segments Intersegment Sales Intersegment Sales Intersegment sales. Number of Operating Segments Aggregated Number of Operating Segments Aggregated Number of operating segments aggregated. Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table] Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table] Scenario, Adjustment [Member] Scenario, Adjustment [Member] Pro Forma [Member] Pro Forma [Member] Nonrecurring Adjustment [Axis] Nonrecurring Adjustment [Axis] Nonrecurring Adjustment [Domain] Nonrecurring Adjustment [Domain] Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Pro forma net sales Business Acquisition, Pro Forma Revenue Pro forma net income Business Acquisition, Pro Forma Net Income (Loss) Pro forma basic earnings per share Business Acquisition, Pro Forma Earnings Per Share, Basic Pro forma diluted earnings per share Business Acquisition, Pro Forma Earnings Per Share, Diluted Effective Income Tax Rate Reconciliation, Percent Income Taxes Income Tax Disclosure [Text Block] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Segment [Domain] Industrial [Member] Water Treatment [Member] Unallocated Amount to Segment [Member] Segment Reconciling Items [Member] Goodwill [Line Items] Goodwill [Line Items] Number of Reportable Segments Goodwill, beginning of period Goodwill, end of period Defined Contribution Plan [Table] Defined Contribution Plan [Table] Collective Bargaining Arrangement [Axis] Collective Bargaining Arrangement [Axis] Collective Bargaining Arrangement [Domain] Collective Bargaining Arrangement [Domain] Bargaining Unit Employee Plans [Member] Bargaining Unit Employee Plans [Member] Bargaining Unit Employee Plans [Member] Defined Contribution Plan Disclosure [Line Items] Defined Contribution Plan Disclosure [Line Items] Profit sharing Defined Contribution Plan, Employer Discretionary Contribution Amount 401(k) matching contributions Defined Contribution Plan, Employer Matching Contribution Amount Defined Contribution Plan, Employer Matching Contribution Amount ESOP Employee Stock Ownership Plan (ESOP), Compensation Expense Nonqualified deferred compensation plan Deferred Compensation Arrangement with Individual, Employer Contribution Bargaining unit employee plans Defined Contribution Plan, Cost Recognized ESPP - all employees Employee Stock Purchase Plans (ESPP), Compensation Expense Employee Stock Purchase Plans (ESPP), Compensation Expense Total contribution expense Profit Sharing, Employee Stock Ownership Plan, Employee Stock Purchase Plan and Defined Contribution Pension Plan Contribution Expense Profit Sharing, Employee Stock Ownership Plan, Employee Stock Purchase Plan and Defined Contribution Pension Plan Contribution Expense Fair Value Disclosures [Abstract] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Business Acquisition, Pro Forma Information [Table Text Block] Business Acquisition, Pro Forma Information [Table Text Block] Summary of performance-based restricted stock units Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Summary of restricted stock awards Schedule of Share-based Compensation, Nonemployee Director Stock Award Plan, Activity [Table Text Block] Debt Debt Disclosure [Text Block] Deferred Compensation Plan, Subsequent Employees Hired Maximum Annual Profit Sharing Percentage Compared to Employees Hired Before Benchmark Date Deferred Compensation Plan, Subsequent Employees Hired Maximum Annual Profit Sharing Percentage Compared to Employees Hired Before Benchmark Date Deferred Compensation Plan, Subsequent Employees Hired Maximum Annual Profit Sharing Percentage Compared to Employees Hired Before Benchmark Date Deferred Compensation, Annual Profit Sharing Per Employee, Percent Deferred Compensation, Annual Profit Sharing Per Employee, Percent Deferred Compensation, Annual Profit Sharing Per Employee, Percent Defined Contribution Plan, Minimum Annual Profit Sharing Per Employee Percent Defined Contribution Plan, Minimum Annual Profit Sharing Per Employee Percent Defined Contribution Plan, Minimum Annual Profit Sharing Per Employee Percent Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Employee Stock Ownership Plan, ESOP, Subsequent Employees Hired Maximum Annual Profit Sharing Percentage Compared to Employees Hired Before Benchmark Date Employee Stock Ownership Plan, ESOP, Subsequent Employees Hired Maximum Annual Profit Sharing Percentage Compared to Employees Hired Before Benchmark Date Employee Stock Ownership Plan, ESOP, Subsequent Employees Hired Maximum Annual Profit Sharing Percentage Compared to Employees Hired Before Benchmark Date Employee Stock Ownership Plan (ESOP), Compensation Expense, Maximum Percent of Eligible Compensation Employee Stock Ownership Plan (ESOP), Compensation Expense, Maximum Percent of Eligible Compensation Employee Stock Ownership Plan (ESOP), Compensation Expense, Maximum Percent of Eligible Compensation Nonqualified deferred compensation plan Percentage of eligible salaries contributed to the nonqualified deferred compensation plan Percentage of eligible salaries contributed to the nonqualified deferred compensation plan Employee Stock Ownership Plan (ESOP), Compensation Expense, Percent of Eligible Compensation Employee Stock Ownership Plan (ESOP), Compensation Expense, Percent of Eligible Compensation Employee Stock Ownership Plan (ESOP), Compensation Expense, Percent of Eligible Compensation Sales Gross profit Selling, general, and administrative expenses Operating income Deferred tax assets: Deferred Tax Assets, Gross [Abstract] Trade receivables Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts Stock compensation accruals Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Pension withdrawal liability Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions Other Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other Total deferred tax assets Deferred Tax Assets, Gross Deferred tax liabilities: Deferred Tax Liabilities, Gross [Abstract] Inventories Deferred Tax Liabilities, Inventory Prepaid Deferred Tax Liabilities, Prepaid Expenses Excess of tax over book depreciation Deferred Tax Liabilities, Property, Plant and Equipment Intangibles Deferred Tax Liabilities, Intangible Assets Unrealized gain on interest rate swap Deferred Tax Liabilities, Unrealized Gains on Trading Securities Total deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred tax liabilities Deferred Tax Liabilities, Net Statement of Comprehensive Income [Abstract] Unrealized gain on available-for-sale investments Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Unrealized gain on interest rate swap Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion Unrealized gain on post-retirement liability Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax Total other comprehensive income Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Business Acquisition, Preliminary purchase price Business Acquisition, Preliminary purchase price Business Acquisition, Preliminary purchase price Total preliminary purchase price Business Combination, Consideration Transferred Payments to Acquire Businesses, Gross Payments to Acquire Businesses, Gross Proceeds from Lines of Credit Proceeds from Lines of Credit Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period Intangible assets Finite-lived Intangible Assets Acquired Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Deferred Taxes, Business Combination, Valuation Allowance, Available to Reduce Goodwill or Intangible Assets, Description Number of operating locations acquired Number of operating locations acquired Number of operating locations acquired Fair Value, Measurement Inputs, Disclosure [Text Block] Fair Value, Measurement Inputs, Disclosure [Text Block] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Customer relationships [Member] Trademarks [Member] Trademarks [Member] Other finite-life intangible assets [Member] Other Finite Life Intangible Assets [Member] Other finite-life intangible assets. Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Summary of intangible assets Intangible Assets, Net (Excluding Goodwill) [Abstract] Finite-life intangible assets Finite-Lived Intangible Assets, Net [Abstract] Gross Amount Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Net carrying value Finite-Lived Intangible Assets, Net Indefinite-life intangible assets Indefinite-Lived Intangible Assets (Excluding Goodwill) Intangible assets, Gross Carrying Amount Intangible Assets Gross Carrying Amount Intangible assets gross carrying amount. Intangible assets, Accumulated Amortization Intangible Assets Accumulated Amortization Intangible assets accumulated amortization. Total intangible assets, net Summary of Segment Information Segment Reporting Information, Additional Information [Abstract] Gross profit Operating income Identifiable assets Assets Not Allocated to a Reporting Segment Assets Not Allocated to a Reporting Segment Capital Expenditures Summary of Inventories Schedule of Inventory, Current [Table Text Block] Nature of Business and Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Assets, Fair Value Disclosure, Recurring Assets, Fair Value Disclosure, Recurring Schedule of future minimum rental payments for operating leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of rent expense Schedule of Rent Expense [Table Text Block] Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Revolving Loan Facility Letter of Credit Revolving Loan Facility Letter of Credit Revolving Loan Facility Letter of Credit Revolving Loan Facility Swingline Subfacility Revolving Loan Facility Swingline Subfacility Revolving Loan Facility Swingline Subfacility Interest rate percent above Federal Funds Effective Rate Interest rate percent above Federal Funds Effective Rate Interest rate percent above Federal Funds Effective Rate Interest rate percent above one-month LIBOR for U.S. dollars Interest rate percent above one-month LIBOR for U.S. dollars Interest rate percent above one-month LIBOR for U.S. dollars LIBOR Margin Minimum LIBOR Margin Minimum LIBOR Margin Minimum LIBOR Margin Median LIBOR Margin Median LIBOR Margin Median LIBOR Margin Maximum LIBOR Margin Maximum LIBOR Margin Maximum Base Rate Margin Minimum Base Rate Margin Minimum Base Rate Margin Minimum Base Rate Margin Median Base Rate Margin Median Base Rate Margin Median Base Rate Margin Maximum Base Rate Margin Maximum Base Rate Margin Maximum Line of Credit Facility, Interest Rate at Period End Line of Credit Facility, Interest Rate at Period End Debt Instrument, Unused Borrowing Capacity, Amount Debt Instrument, Unused Borrowing Capacity, Amount Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Payments of Debt Issuance Costs Amortization of debt issuance costs Amortization of Financing Costs and Discounts Unamortized Debt Issuance Expense Fixed Charge Coverage Ratio Fixed Charge Coverage Ratio Debt Instrument, Covenant Compliance, Fixed Charge Coverage Ratio Cash flow leverage ratio Cash flow leverage ratio Cash flow leverage ratio