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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net Income $ 48,575 $ 35,202
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 26,662 21,165
Impairment of software   11,881
Deferred taxes 5,757 8,288
Compensation expense related to share-based compensation plans 5,843 6,238
Gain on sale of assets (116) (20)
Excess tax benefits from share based compensation (40)  
Changes in operating assets and liabilities:    
Restricted investments 1,389 (875)
Accounts receivable, net 6,540 (49,102)
Prepaid taxes 13,579 (5,794)
Prepaid expenses and other current assets (1,442) (7,104)
Other assets (56) (1,572)
Accounts payable 21,308 38,281
Accrued expenses 8,337 2,581
Non-current liabilities (3,505) (534)
Net cash provided by operating activities 132,831 58,635
Cash flows from investing activities:    
Proceeds from sale of equipment 922 420
Purchases of property and equipment (40,951) (75,881)
Net cash used in investing activities (40,029) (75,461)
Cash flows from financing activities:    
Proceeds from issuance of debt 31,376 49,268
Repayments of long term debt (16,836) (4,198)
Stock tendered for payments of withholding taxes (2,902) (3,184)
Purchase of treasury stock (28,823)  
Capital lease payments (1,883) (1,632)
Excess tax benefits from share-based compensation 166 434
Net cash (used in) provided by financing activities (18,902) 40,688
Effect of exchange rate changes on cash and cash equivalents (122) 1
Net increase in cash and cash equivalents 73,778 23,863
Cash and cash equivalents beginning of the year 109,769 68,964
Cash and cash equivalents end of the year 183,547 92,827
Supplemental disclosures of cash paid for:    
Interest 2,227 1,036
Income taxes $ 6,469 $ 20,069