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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities:    
Net income $ 35,202 $ 52,574
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 21,165 15,479
Impairment of software 11,881  
Deferred taxes 8,288 10,945
Compensation expense related to share-based compensation plans 6,238 5,638
Gain on sale of assets (20) (345)
Excess tax benefits from share-based compensation 0 (11)
Changes in operating assets and liabilities:    
Restricted investments (875) (1,924)
Accounts receivable, net (49,102) (57,439)
Prepaid taxes (5,794) (504)
Prepaid expenses and other current assets (7,104) 156
Other assets (1,572) (803)
Accounts payable 38,281 55,641
Accrued expenses 2,581 1,330
Non-current liabilities (534) 1,164
Net cash provided by operating activities 58,635 81,901
Cash flows from investing activities:    
Proceeds from sale of equipment 420 1,788
Purchases of property and equipment (75,881) (66,079)
Net cash used in investing activities (75,461) (64,291)
Cash flows from financing activities:    
Proceeds from issuance of debt 49,268 9,120
Repayments of long term debt (4,198) (436)
Proceeds from stock options exercised   42
Stock tendered for payments of withholding taxes (3,184) (2,621)
Purchase of treasury stock   (903)
Capital lease payments (1,632) (1,733)
Excess tax benefits from share-based compensation 434 310
Net cash provided by financing activities 40,688 3,779
Effect of exchange rate changes on cash and cash equivalents 1 1
Net increase in cash and cash equivalents 23,863 21,390
Cash and cash equivalents beginning of period 68,964 70,760
Cash and cash equivalents end of period 92,827 92,150
Supplemental disclosures of cash paid for:    
Interest 1,036 887
Income taxes $ 20,069 $ 24,372