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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities    
Net income $ 7,201 $ 7,078
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Loss (gain) on sale of assets 23 (25)
Depreciation and amortization 6,721 4,972
Impairment loss on assets held for sale 461  
Deferred income taxes (205) (740)
Noncash compensation related to stock plans 3,184 1,521
Loss in equity method investment   14
Excess tax benefit of options exercised (99) 4
Provision for doubtful accounts (87) 126
Changes in operating assets and liabilities, net of acquisitions:    
Trade accounts receivable (26,585) (21,896)
Inventories 3,154 (13,103)
Trade accounts payable 10,379 (6,250)
Income taxes payable 3,899 2,943
Accrued profit sharing trust contributions (2,802) 905
Accrued cash profit sharing and commissions 3,115 2,534
Other current assets 723 (692)
Accrued liabilities (9,865) (647)
Long-term liabilities 313 627
Accrued workers' compensation 10 31
Other noncurrent assets 1,100 190
Net cash provided by (used in) operating activities 640 (22,408)
Cash flows from investing activities    
Capital expenditures (3,249) (10,095)
Asset acquisitions, net of cash acquired (56,040)  
Proceeds from sale of property and equipment 6,847 1,786
Net cash used in investing activities (52,442) (8,309)
Cash flows from financing activities    
Repayment of debt and line of credit borrowings (41)  
Issuance of common stock 1,758 154
Excess tax benefit of options exercised 99 (4)
Dividends paid (6,020) (5,010)
Net cash used in financing activities (4,204) (4,860)
Effect of exchange rate changes on cash and cash equivalents 2,281 1,759
Net decrease in cash and cash equivalents (53,725) (33,818)
Cash and cash equivalents at beginning of period 213,817 335,049
Cash and cash equivalents at end of period 160,092 301,231
Noncash activity during the period    
Noncash capital expenditures 70 66
Dividends declared but not paid 6,038 6,263
Issuance of Company's common stock for compensation 418 204
Asset acquisitions $ 786