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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 $ 49,109 $ 41,164
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 16,300 10,944
Deferred taxes 7,693 7,189
Compensation expense related to share-based compensation plans 4,826 3,675
Loss (gain) on sale of assets 42 (16)
Excess tax benefits from share-based compensation (97)  
Changes in operating assets and liabilities, net of effects of acquisition:    
Restricted investments (2,206) 362
Accounts receivable, net (57,417) (57,275)
Prepaid taxes 2,253 167
Prepaid expenses and other current assets (1,913) (2,275)
Other assets 685 406
Accounts payable 38,386 29,316
Accrued expenses 8,917 12,881
Non-current liabilities 1,210 (344)
Net cash provided by operating activities 67,788 46,194
Cash flows from investing activities:    
Proceeds from sale of equipment 819 316
Purchases of property and equipment (34,671) (35,382)
Cash used in acquisitions, net of cash acquired (425) (83,057)
Net cash used in investing activities (34,277) (118,123)
Cash flows from financing activities:    
Proceeds from stock options exercised 46 78
Stock tendered for payments of withholding taxes (1,800) (1,513)
Capital lease payments (1,697) (185)
Excess tax benefits from share-based compensation 443 1,069
Net cash used in financing activities (3,008) (551)
Effect of exchange rate changes on cash and cash equivalents (9) (12)
Net increase (decrease) in cash and cash equivalents 30,494 (72,492)
Cash and cash equivalents beginning of period 49,091 115,144
Cash and cash equivalents end of period 79,585 42,652
Supplemental disclosures of cash paid for:    
Interest 917 238
Income taxes $ 20,286 $ 11,784