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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net income $ 33,974 $ 30,614
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 9,954 11,004
Deferred taxes 6,548 4,432
Compensation expense related to share-based compensation plans 3,757 3,229
Gain on sale of assets (287) (48)
Excess tax benefits from share-based compensation (8) (83)
Changes in operating assets and liabilities:    
Restricted investments (541) (1,113)
Accounts receivable, net (45,558) (29,883)
Prepaid taxes (48) 1,389
Prepaid expenses and other current assets (417) (3,329)
Other assets (120) 589
Accounts payable 30,685 9,877
Accrued expenses (3,680) (741)
Non-current liabilities 118 200
Net cash provided by operating activities 34,377 26,137
Cash flows from investing activities:    
Proceeds from sale of equipment 1,358 643
Purchases of property and equipment (39,202) (21,043)
Cash used in acquisitions, net of cash acquired   (300)
Net cash used in investing activities (37,844) (20,700)
Cash flows from financing activities:    
Proceeds from issuance of debt 9,120  
Proceeds from stock options exercised 41 45
Stock tendered for payments of withholding taxes (2,585) (1,770)
Purchase of treasury stock (903)  
Capital lease payments (1,143) (1,107)
Excess tax benefits from share-based compensation 177 492
Net cash provided by (used in) financing activities 4,707 (2,340)
Effect of exchange rate changes on cash and cash equivalents   (3)
Net increase in cash and cash equivalents 1,240 3,094
Cash and cash equivalents beginning of period 70,760 49,091
Cash and cash equivalents end of period 72,000 52,185
Supplemental disclosures of cash paid for:    
Interest 581 626
Income taxes $ 16,740 $ 12,556