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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities    
Net income $ 36,036 $ 45,951
Adjustments to reconcile net income to net cash provided by operating activities:    
Loss on sale of assets 42 1
Depreciation and amortization 20,744 14,988
Impairment loss on assets held for sale 461 1,094
Deferred income taxes (500) (1,049)
Noncash compensation related to stock plans 7,364 3,812
Income in equity method investment   (4,389)
Excess tax benefit of options exercised (99) 4
Provision for doubtful accounts 470 249
Accrued interest earned from related party   (58)
Changes in operating assets and liabilities, net of acquisitions:    
Trade accounts receivable (28,630) (30,174)
Inventories 14,067 (19,778)
Trade accounts payable (381) (4,211)
Income taxes payable 3,731 5,755
Accrued profit sharing trust contributions (488) (2,017)
Accrued cash profit sharing and commissions 5,458 9,068
Other current assets 3,686 (220)
Accrued liabilities (791) 3,856
Long-term liabilities (1,159) (302)
Accrued workers' compensation (595) 771
Other noncurrent assets (2,723) 729
Net cash provided by operating activities 56,693 24,080
Cash flows from investing activities    
Capital expenditures (16,128) (23,515)
Asset acquisitions, net of cash acquired (56,003)  
Proceeds from sale of property and equipment 6,937 3,205
Loans repaid by related parties 1,698 552
Net cash used in investing activities (63,496) (19,758)
Cash flows from financing activities    
Repurchase of common stock   (53,208)
Debt and line of credit borrowings 2,156  
Repayment of debt and line of credit borrowings (5,655)  
Debt issuance costs (1,408)  
Issuance of common stock 2,184 154
Excess tax benefit of options exercised 99 (4)
Dividends paid (18,099) (17,309)
Net cash used in financing activities (20,723) (70,367)
Effect of exchange rate changes on cash and cash equivalents 1,180 (3,842)
Net decrease in cash and cash equivalents (26,346) (69,887)
Cash and cash equivalents at beginning of period 213,817 335,049
Cash and cash equivalents at end of period 187,471 265,162
Noncash activity during the period    
Noncash capital expenditures 520 3,251
Dividends declared but not paid 6,040 5,805
Issuance of Company's common stock for compensation 418 204
Non-cash contingent consideration $ 786