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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income $ 10,334 $ 17,965
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 12,522 10,639
Deferred taxes 5,279 2,383
Compensation expense related to share-based compensation plans 2,609 2,181
Gain on sale of assets (48) (83)
Excess tax benefits from share based compensation   (30)
Changes in operating assets and liabilities:    
Restricted investments (1,436) 1,685
Accounts receivable, net 54,600 21,332
Prepaid taxes (171) 26
Prepaid expenses and other current assets 2,795 1,409
Other assets 373 400
Accounts payable (13,175) 5,421
Accrued expenses (25,990) (13,517)
Non-current liabilities 12 481
Net cash provided by operating activities 47,704 50,292
Cash flows from investing activities:    
Proceeds from sale of equipment 1,127 592
Purchases of property and equipment (6,625) (4,893)
Net cash used in investing activities (5,498) (4,301)
Cash flows from financing activities:    
Repayments of long term debt (11,782) (8,132)
Stock tendered for payments of withholding taxes (3,157) (2,208)
Purchase of treasury stock   (42,368)
Capital lease payments (727) (643)
Excess tax benefits from share-based compensation   (134)
Net cash used in financing activities (15,666) (53,485)
Effect of exchange rate changes on cash and cash equivalents 56 1
Net increase (decrease) in cash and cash equivalents 26,596 (7,493)
Cash and cash equivalents beginning of the period 127,404 207,749
Cash and cash equivalents end of the period 154,000 200,256
Supplemental disclosures of cash paid for:    
Interest 1,153 1,245
Income taxes $ 263 $ 5,586