Document and Entity Information Document and Entity Information Statement [Table] Statement [Line Items] Document Type Amendment Flag Document Period End Date Document Fiscal Period Focus Document Fiscal Year Focus Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Filer Category Entity Common Stock, Shares Outstanding Entity Current Reporting Status Entity Public Float Entity Voluntary Filers Entity Well-known Seasoned Issuer Consolidated Balance Sheets Assets [Abstract] Assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of year Cash and cash equivalents at beginning of year Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value, Total Available-for-sale Securities, Current Marketable securities Available-for-sale Securities, Current, Total Accounts Receivable, Net, Current Accounts receivable, net Accounts Receivable, Net, Current, Total Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer). This also reflects the difference between (a) inventory at the lower of LIFO cost or market and (b) inventory at replacement cost or at the lower of some acceptable inventory accounting method (such as FIFO or average cost), or market. If material, reflects an excess of replacement or current cost over stated LIFO value parenthetically on the balance sheet or in a note to the financial statements. Inventories Inventories Prepaid Expense, Current Prepaid expenses Prepaid Expense, Current, Total Income Taxes Receivable Income taxes recoverable Assets, Current Total current assets Property, Plant and Equipment, Net Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property and equipment, net Property, Plant and Equipment, Net, Total Goodwill Goodwill, Ending Balance Goodwill, Beginning Balance Goodwill Goodwill, Total Intangible Assets, Net (Excluding Goodwill) Intangible and other assets, net Intangible Assets, Net (Excluding Goodwill), Total Assets Total assets Liabilities and Stockholders' Equity [Abstract] Liabilities [Abstract] Liabilities Accounts Payable, Current Accounts payable Accounts Payable, Current, Total Accrued Liabilities, Current Accrued expenses Accrued Liabilities, Current, Total Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probably being asserted. These losses arise from workers' compensation, general liability, vehicle accident and associate medical benefit claims. This is the amount needed to reflect the estimated ultimate cost of settling unasserted claims estimated to have been incurred by the entity on or before the balance sheet date. Accrued self-insurance Accrued self-insurance Deferred Revenue, Current Deferred revenue, net Deferred Revenue, Current, Total Deferred Tax Liabilities, Current Deferred income taxes Liabilities, Current Total current liabilities Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent Postretirement benefit obligations Deferred Tax Liabilities, Noncurrent Deferred income taxes Liabilities Total liabilities Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Shareholders' Equity Common Stock, Value, Issued Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common stock, no par value, 100,800,000 shares authorized, 33,047,807 shares issued Common Stock, Value, Issued, Total Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Retained earnings Retained Earnings (Accumulated Deficit), Total Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Ending Balance Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Beginning Balance Accumulated other comprehensive income, net The total value as of the balance sheet date of common stock, retained earnings, and accumulated other comprehensive income, before deducting the value of treasury stock. ShareholdersEquityBeforeTreasuryStock Shareholders' equity before treasury stock Treasury Stock, Value Treasury stock at cost, 6,149,364 shares Treasury Stock, Value, Ending Balance Treasury Stock, Value, Beginning Balance Treasury stock at cost, 6,149,364 shares Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Balance, Balance, Balance Total shareholders' equity Liabilities and Stockholders' Equity Total liabilities and shareholders' equity Common Stock, No Par Value Common Stock, Shares Authorized Common Stock, Shares Authorized Common Stock, Shares, Issued Common Stock, Shares, Issued Common Stock, Shares, Issued, Total Treasury Stock, Shares Treasury Stock, Shares, Ending Balance Treasury Stock, Shares, Beginning Balance Treasury Stock, Shares Consolidated Statements of Income Sales Revenue, Goods, Net Net sales Sales Revenue, Goods, Net, Total Cost of sales consists of direct product costs (net of discounts and allowances), warehouse costs, transportation costs and manufacturing facility costs. Also included are vendor allowances recorded as credits in cost of sales. Cost of sales, including warehousing and distribution expenses Gross Profit Gross profit on sales Gross profit on sales Selling, General and Administrative Expense Operating, general, and administrative expenses Selling, General and Administrative Expense, Total Operating Income (Loss) Income from operations Investment Income, Net Investment income Investment Income, Net, Total Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Cumulative Effects of Changes in Accounting Principles, Noncontrolling Interest Income before provision for income taxes Current Income Tax Expense (Benefit) Provision for income taxes Current Income Tax Expense (Benefit), Total Net Income (Loss) Attributable to Parent Net income Net income The average number of shares or units issued and outstanding that are used in calculating basic and diluted EPS. Weighted-average shares outstanding, basic and diluted Common Stock, Dividends, Per Share, Declared Cash dividends per share Earnings Per Share, Basic and Diluted Basic and diluted earnings per share Earnings Per Share, Basic and Diluted, Total Consolidated Statements of Comprehensive Income Consolidated Statements of Comprehensive Income Unrealized holding gains arising during period (Net of deferred tax) Unrealized holding gains arising during period (Net of deferred taxes of $923, $288, and $47, respectively) Reclassification adjustment for gains included in net income (net of deferred taxes) Reclassification adjustment for gains included in net income (Net of deferred taxes of $601, $93, and $0, respectively) Other Comprehensive Income (Loss), Net of Tax Other comprehensive income, net of reclassification adjustments and tax Other comprehensive income, net of tax Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income, net of tax Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent Unrealized holding gains arising during period, tax Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent, Total Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Tax Reclassification adjustment for gains included in net income, tax Statement of Stockholders' Equity [Abstract] Shares, Outstanding Balance, shares Balance, shares Balance, shares, Treasury Stock, Value, Acquired, Cost Method Treasury stock purchased Treasury stock purchased Treasury Stock, Shares, Acquired Treasury Stock, Shares Dividends Dividends paid Dividends paid Dividends, Total Consolidated Statements of Cash Flows Cash and Cash Equivalents, Period Increase (Decrease) [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Depreciation Depreciation, Total Amortization of Intangible Assets Amortization Amortization of Intangible Assets, Total Gain (Loss) on Sale of Property Plant Equipment Gain loss on disposition / impairment of fixed assets (Gain) loss on disposition of fixed assets Gain (Loss) on Sale of Property Plant Equipment, Total Gain (Loss) on Sale of Investments Gain on sale of marketable securities Gain (Loss) on Sale of Investments, Total Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Inventories Inventories Inventories Increase (Decrease) in Inventories, Total The net change during the reporting period of the sum of amounts due within one year (or one business cycle) from customers for the credit sale of goods and services. Also includes the net change during the reporting period in the amount of outstanding money paid in advance for goods or services that bring economic benefits for future periods. Increase (Decrease) in Accounts Receivable and Prepaid Expenses Accounts receivable and prepaid expenses Increase (Decrease) in Income Taxes Receivable Income taxes recoverable Income taxes recoverable Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities, Total Increase (Decrease) in Accrued Income Taxes Payable Income taxes payable Deferred Income Tax Expense (Benefit) Deferred income taxes Deferred Income Tax Expense (Benefit), Total Increase (Decrease) in Other Operating Assets and Liabilities, Net Other Increase (Decrease) in Other Operating Assets and Liabilities, Net, Total Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Payments to Acquire Property, Plant, and Equipment Purchase of property and equipment Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment, Total Proceeds from Sale of Property, Plant, and Equipment Proceeds from the sale of property and equipment Proceeds from Sale of Property, Plant, and Equipment, Total Payments to Acquire Available-for-sale Securities Purchase of marketable securities Purchase of marketable securities Payments to Acquire Available-for-sale Securities, Total Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Proceeds from maturities of marketable securities Proceeds from Sale of Held-to-maturity Securities Proceeds from the sale of marketable securities Proceeds from Sale of Available-for-sale Securities, Total Payments to Acquire Businesses, Net of Cash Acquired Acquisition of business Acquisition of business Payments to Acquire Businesses, Net of Cash Acquired, Total Payments to Acquire Intangible Assets Purchase of intangible assets Purchase of intangible assets Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Payments of Dividends, Common Stock Dividends paid Dividends paid Payments for Repurchase of Common Stock Purchase of treasury stock Purchase of treasury stock Net Cash Provided by (Used in) Financing Activities Net cash used in financing activities Cash and Cash Equivalents, Period Increase (Decrease) Net (decrease) increase in cash and cash equivalents Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Marketable Securities Marketable Securities [Text Block] Marketable Securities Inventories Disclosure Inventories Text Inventories Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Property and Equipment Leases Commitments Leases of Lessee Disclosure [Text Block] Lease Commitments Retirement Plans Postemployment Benefits Disclosure [Text Block] Retirement Plans Income Taxes Income Tax Disclosure [Text Block] Income Taxes Acquisition of Business Mergers, Acquisitions and Dispositions Disclosures [Text Block] Acquisition of Business Acquisition of Business Summary of Quarterly Results Quarterly Financial Information [Text Block] Summary of Quarterly Results Fair Value Information Fair Value Disclosures [Text Block] Fair Value Information Contingencies Contingencies Disclosure [Text Block] Contingencies Statement, Scenario [Axis] Scenario Unspecified [Domain] Scenario, Unspecified [Domain] Common Stock [Member] Common Stock [Member] Retained Earnings [Member] Retained Earnings [Member] Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Income (Loss) [Member] Treasury Stock [Member] Treasury Stock [Member]