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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities    
Net income $ 4,795 $ 7,201
Adjustments to reconcile net income to net cash provided (used) by operating activities:    
Loss (gain) on sale of assets (8) 23
Depreciation and amortization 7,487 6,721
Impairment loss on assets 1,024 461
Deferred income taxes 2,093 (205)
Noncash compensation related to stock plans 2,977 3,184
Excess tax benefit of options exercised   (99)
Provision for doubtful accounts (39) (87)
Changes in operating assets and liabilities, net of acquisitions:    
Trade accounts receivable (21,006) (26,585)
Inventories 823 3,154
Trade accounts payable (5,578) 10,379
Income taxes payable 927 3,899
Accrued profit sharing trust contributions (3,335) (2,802)
Accrued cash profit sharing and commissions 1,318 3,115
Other current assets 16 723
Accrued liabilities (9,179) (9,865)
Long-term liabilities (612) 313
Accrued workers' compensation (18) 10
Other noncurrent assets (417) 1,100
Net cash provided by (used in) operating activities (18,732) 640
Cash flows from investing activities    
Capital expenditures (4,632) (3,249)
Asset acquisitions, net of cash acquired (5,300) (56,040)
Proceeds from sale of property and equipment 17 6,847
Loan repayment by related parties 605  
Net cash used in investing activities (9,310) (52,442)
Cash flows from financing activities    
Debt and line of credit borrowings 1,080  
Repayment of debt and line of credit borrowings (20) (41)
Issuance of common stock 496 1,758
Excess tax benefit of options exercised   99
Dividends paid (6,053) (6,020)
Net cash used in financing activities (4,497) (4,204)
Effect of exchange rate changes on cash and cash equivalents (1,049) 2,281
Net decrease in cash and cash equivalents (33,588) (53,725)
Cash and cash equivalents at beginning of period 175,553 213,817
Cash and cash equivalents at end of period 141,965 160,092
Noncash activity during the period    
Noncash capital expenditures 140 70
Dividends declared but not paid   6,038
Issuance of Company's common stock for compensation 315 418
Non-cash contingent consideration   $ 786