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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net income $ 12,035 $ 15,364
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 6,779 5,096
Deferred taxes 1,991 2,669
Compensation expense related to share-based compensation plans 2,143 1,882
Gain on sale of assets (6) (214)
Excess tax benefits from share-based compensation   (3)
Changes in operating assets and liabilities:    
Restricted investments (117) (181)
Accounts receivable, net (31,471) (11,893)
Prepaid taxes 86 (30)
Prepaid expenses and other current assets (597) 2,227
Other assets (837) (146)
Accounts payable 29,286 16,230
Accrued expenses 1,128 (2,801)
Non-current liabilities (1,839) (198)
Net cash provided by operating activities 18,581 28,002
Cash flows from investing activities:    
Proceeds from sale of equipment 85 734
Purchases of property and equipment (33,035) (9,456)
Net cash used in investing activities (32,950) (8,722)
Cash flows from financing activities:    
Proceeds from issuance of debt 25,361  
Repayments of long term debt (1,124)  
Proceeds from stock options exercised   42
Stock tendered for payments of withholding taxes (3,023) (2,469)
Purchase of treasury stock   (903)
Capital lease payments (616) (560)
Excess tax benefits from share-based compensation 104 98
Net cash provided by (used in) financing activities 20,702 (3,792)
Effect of exchange rate changes on cash and cash equivalents   3
Net increase in cash and cash equivalents 6,333 15,491
Cash and cash equivalents beginning of period 68,964 70,760
Cash and cash equivalents end of period 75,297 86,251
Supplemental disclosures of cash paid for:    
Interest 380 311
Income taxes $ 777 $ 3,438