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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities      
Net income $ 41,918 $ 50,900 $ 28,586
Adjustments to reconcile net income to net cash provided by operating activities:      
Loss (gain) on sale of assets 166 191 (4,763)
Loss on sale of discontinued operations     657
Depreciation and amortization 26,857 20,751 22,861
Impairment loss on discontinued operations     16,916
Impairment of long-lived assets 803 1,094 419
Impairment of goodwill 2,346 1,282 6,292
Deferred income taxes 189 (2,163) 6,956
Noncash compensation related to stock plans 10,667 6,837 3,712
Loss (gain) in equity method investment   (4,389) 535
Excess tax benefit of options exercised (110)   (10)
Write down of excess and obsolete inventory   750 5,046
Provision for (recovery of) doubtful accounts 355 67 (81)
Accrued interest earned from related party   (58)  
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions:      
Trade accounts receivable (2,678) (6,982) (3,715)
Inventories (17,045) (26,946) (12,143)
Other current assets 3,970 (190) 1,026
Other noncurrent assets (244) 1,376 41
Trade accounts payable 12,208 (10,126) 4,678
Accrued liabilities (909) 2,899 2,223
Accrued profit sharing trust contributions 703 (1,102) (1,442)
Accrued cash profit sharing and commissions (54) 673 432
Other long-term liabilities (1,433) (1,112) (1,257)
Accrued workers' compensation (783) 790 332
Income taxes payable (8,874) 545 (104)
Net cash provided by operating activities 68,052 35,087 77,197
Cash flows from investing activities      
Capital expenditures (21,961) (26,063) (28,341)
Asset acquisitions, net of cash acquired (65,125) (51,853) (5,214)
Loans made to related parties     (1,798)
Loan repayments by related parties 1,698 552 50
Proceeds from sale of discontinued operations     28,346
Proceeds from sale of capital assets 7,642 3,081 14,841
Net cash provided by (used in) investing activities (77,746) (74,283) 7,884
Cash flows from financing activities      
Line of credit borrowings 2,183    
Repayment of line of credit borrowings (5,747)    
Debt issuance costs (1,415)    
Contingent consideration of asset acquisitions (354)    
Repurchase of common stock   (53,208)  
Issuance of Company's common stock 4,925 214 17,948
Excess tax benefit of options exercised 110   10
Dividends paid (30,193) (23,329) (19,764)
Net cash used in financing activities (30,491) (76,323) (1,806)
Effect of exchange rate changes on cash 1,921 (5,713) 1,393
Net increase (decrease) in cash and cash equivalents (38,264) (121,232) 84,668
Cash and cash equivalents at beginning of year 213,817 335,049 250,381
Cash and cash equivalents at end of year 175,553 213,817 335,049
Cash paid during the year for      
Interest 350 279 232
Income taxes 31,391 30,789 20,508
Noncash activity during the year for      
Capital expenditures 974 402 3,276
Asset acquisition 786 363  
Stock based compensation 418 204 301
Dividends declared but not paid 6,053 6,020 5,013
Equity method investment acquisition (Note 6)   708  
Contribution in excess of pension benefit cost $ 57