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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net Income $ 17,965 $ 10,276
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 10,639 8,731
Deferred taxes 2,383 1,593
Compensation expense related to share-based compensation plans 2,181 2,034
Gain on sale of assets (83)  
Excess tax benefits from share based compensation (30) (13)
Changes in operating assets and liabilities:    
Restricted investments 1,685 98
Accounts receivable, net 21,332 2,874
Prepaid taxes 26 4,557
Prepaid expenses and other current assets 1,409 (3,246)
Other assets 400 330
Accounts payable 5,421 13,414
Accrued expenses (13,517) 5,733
Non-current liabilities 481 (1,052)
Net cash provided by operating activities 50,292 45,329
Cash flows from investing activities:    
Proceeds from sale of equipment 592 26
Purchases of property and equipment (4,893) (15,057)
Net cash used in investing activities (4,301) (15,031)
Cash flows from financing activities:    
Proceeds from issuance of debt   11,480
Repayments of long term debt (8,132) (5,553)
Stock tendered for payments of withholding taxes (2,208) (2,754)
Purchase of treasury stock (42,368) (13,419)
Capital lease payments (643) (605)
Excess tax benefits from share-based compensation (134) 42
Net cash used in financing activities (53,485) (10,809)
Effect of exchange rate changes on cash and cash equivalents 1 3
Net (decrease) increase in cash and cash equivalents (7,493) 19,492
Cash and cash equivalents beginning of the period 207,749 109,769
Cash and cash equivalents end of the period 200,256 129,261
Supplemental disclosures of cash paid for:    
Interest 1,245 789
Income taxes $ 5,586 $ 194