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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net income $ 30,711 $ 33,974
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 13,780 9,954
Deferred taxes 5,557 6,548
Compensation expense related to share-based compensation plans 4,191 3,757
Gain on sale of assets (10) (287)
Excess tax benefits from share-based compensation   (8)
Changes in operating assets and liabilities:    
Restricted investments (1,206) (541)
Accounts receivable, net (40,654) (45,558)
Prepaid taxes (165) (48)
Prepaid expenses and other current assets (2,063) (417)
Other assets (601) (120)
Accounts payable 21,756 30,685
Accrued expenses 882 (3,680)
Non-current liabilities (537) 118
Net cash provided by operating activities 31,641 34,377
Cash flows from investing activities:    
Proceeds from sale of equipment 319 1,358
Purchases of property and equipment (46,443) (39,202)
Net cash used in investing activities (46,124) (37,844)
Cash flows from financing activities:    
Proceeds from issuance of debt 25,361 9,120
Repayments of debt (2,535)  
Proceeds from stock options exercised   41
Stock tendered for payments of withholding taxes (3,151) (2,585)
Purchase of treasury stock   (903)
Capital lease payments (1,219) (1,143)
Excess tax benefits from share-based compensation 228 177
Net cash provided by financing activities 18,684 4,707
Effect of exchange rate changes on cash and cash equivalents (1)  
Net increase in cash and cash equivalents 4,200 1,240
Cash and cash equivalents beginning of period 68,964 70,760
Cash and cash equivalents end of period 73,164 72,000
Supplemental disclosures of cash paid for:    
Interest 738 581
Income taxes $ 10,769 $ 16,740