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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 $ 30,614 $ 24,888
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 11,004 6,292
Deferred taxes 4,432 2,733
Compensation expense related to share-based compensation plans 3,229 2,433
Gain on sale of assets (48) (8)
Excess tax benefits from share-based compensation (83)  
Changes in operating assets and liabilities, net of effect of acquisitions:    
Restricted investments (1,113) (1,043)
Accounts receivable, net (29,883) (62,743)
Prepaid taxes 1,389 169
Prepaid expenses and other current assets (3,329) (3,976)
Other assets 589 305
Accounts payable 9,877 31,079
Accrued expenses (741) 8,445
Non-current liabilities 200 1,400
Net cash provided by operating activities 26,137 9,974
Cash flows from investing activities:    
Proceeds from sale of equipment 643 214
Purchases of property and equipment (21,043) (15,281)
Cash used in acquisitions, net of cash acquired (300) (90,909)
Net cash used in investing activities (20,700) (105,976)
Cash flows from financing activities:    
Proceeds from stock options exercised 45 26
Stock tendered for payments of withholding taxes (1,770) (1,477)
Capital lease payments (1,107)  
Excess tax benefits from share-based compensation 492 584
Net cash used in financing activities (2,340) (867)
Effect of exchange rate changes on cash and cash equivalents (3) 4
Net increase (decrease) in cash and cash equivalents 3,094 (96,865)
Cash and cash equivalents beginning of period 49,091 115,144
Cash and cash equivalents end of period 52,185 18,279
Supplemental disclosures of cash paid for:    
Interest 626 83
Income taxes $ 12,556 $ 7,529