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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income $ 35,210 $ 56,561
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 43,531 32,665
Deferred taxes 19,983 13,269
Compensation expense related to share-based compensation plans 7,402 6,318
Loss (gain) on sale of assets 360 (382)
Excess tax benefits from share based compensation   (524)
Changes in operating assets and liabilities:    
Restricted investments (3,189) 545
Accounts receivable, net (37,448) (62,324)
Prepaid taxes (11,839) (1,609)
Prepaid expenses and other current assets (3,059) 1,244
Other assets (3,505) 961
Accounts payable 51,459 37,080
Accrued expenses (13,179) (6,968)
Non-current liabilities 1,419 2,181
Net cash provided by operating activities 87,145 79,017
Cash flows from investing activities:    
Proceeds from sale of equipment 3,052 1,573
Purchases of property and equipment (39,936) (59,883)
Acquisitions, net of cash acquired (165,933)  
Net cash used in investing activities (202,817) (58,310)
Cash flows from financing activities:    
Proceeds from issuance of debt 73,606 36,100
Repayments of long term debt (59,921) (25,074)
Stock tendered for payments of withholding taxes (3,410) (2,484)
Purchase of treasury stock   (100,000)
Capital lease payments (2,101) (1,965)
Excess tax benefits from share-based compensation   212
Payment of debt issuance costs (1,397)  
Net cash provided by (used in) financing activities 6,777 (93,211)
Effect of exchange rate changes on cash and cash equivalents 49 (50)
Net decrease in cash and cash equivalents (108,846) (72,554)
Cash and cash equivalents beginning of the period 127,404 207,749
Cash and cash equivalents end of the period 18,558 135,195
Supplemental disclosures of cash paid for:    
Interest 4,033 2,636
Income taxes $ 12,880 $ 26,826