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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 $ 13,662 $ 10,498
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 5,516 2,629
Deferred taxes 3,352 1,266
Compensation expense related to share-based compensation plans 1,637 1,225
Loss (gain) on sale of assets 1 (13)
Excess tax benefits from share-based compensation (83)  
Changes in operating assets and liabilities:    
Restricted investments (1,509) (707)
Accounts receivable, net (14,043) (23,411)
Prepaid taxes 2,243 173
Prepaid expenses and other current assets 2,205 1,738
Other assets 445 31
Accounts payable 8,377 32,229
Accrued expenses 22 (560)
Non-current liabilities 1,010 407
Net cash provided by operating activities 22,835 25,505
Cash flows from investing activities:    
Proceeds from sale of equipment 52 68
Purchases of property and equipment (17,013) (4,880)
Cash used in acquisitions (150) (55)
Net cash used in investing activities (17,111) (4,867)
Cash flows from financing activities:    
Proceeds from stock options exercised 16 24
Purchase of treasury stock (1,665) (1,447)
Capital lease payments (546)  
Excess tax benefits from share-based compensation 74 540
Net cash used in financing activities (2,121) (883)
Effect of exchange rate changes on cash and cash equivalents 1 4
Net increase in cash and cash equivalents 3,604 19,759
Cash and cash equivalents beginning of period 49,091 115,144
Cash and cash equivalents end of period 52,695 134,903
Supplemental disclosures of cash paid for:    
Interest 333 31
Income taxes $ 472 $ 1,335