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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities    
Net income $ 23,060 $ 26,571
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Loss on sale of assets 10 48
Depreciation and amortization 13,813 10,055
Impairment loss on assets held for sale 461 1,094
Deferred income taxes (681) (1,026)
Noncash compensation related to stock plans 5,300 2,377
Loss in equity method investment   82
Excess tax benefit of options exercised (99) 4
Provision for doubtful accounts 225 179
Accrued interest earned from related party   (58)
Changes in operating assets and liabilities, net of acquisitions:    
Trade accounts receivable (40,837) (48,234)
Inventories (47) (12,404)
Trade accounts payable 10,694 (2,386)
Income taxes payable 4,462 7,890
Accrued profit sharing trust contributions (2,085) (2,611)
Accrued cash profit sharing and commissions 6,873 10,160
Other current assets 3,537 410
Accrued liabilities (4,775) 3,215
Long-term liabilities (250) (42)
Accrued workers' compensation (613) 979
Other noncurrent assets (2,168) 352
Net cash provided by (used in) operating activities 16,880 (3,345)
Cash flows from investing activities    
Capital expenditures (9,629) (14,095)
Asset acquisitions, net of cash acquired (56,044)  
Proceeds from sale of property and equipment 6,958 3,156
Loans repaid by related parties   26
Net cash used in investing activities (58,715) (10,913)
Cash flows from financing activities    
Repurchase of common stock   (50,075)
Debt and line of credit borrowings 2,146  
Repayment of debt and line of credit borrowings (954)  
Debt issuance costs (25)  
Issuance of common stock 1,983 154
Excess tax benefit of options exercised 99 (4)
Dividends paid (12,059) (11,274)
Net cash used in financing activities (8,810) (61,199)
Effect of exchange rate changes on cash and cash equivalents (453) 2,421
Net decrease in cash and cash equivalents (51,098) (73,036)
Cash and cash equivalents at beginning of period 213,817 335,049
Cash and cash equivalents at end of period 162,719 262,013
Noncash activity during the period    
Noncash capital expenditures 258 1,587
Dividends declared but not paid 6,044 6,263
Issuance of Company's common stock for compensation 418 204
Non-cash contingent consideration $ 786