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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net income $ 152,829 $ 35,210
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 59,184 43,531
Deferred taxes 33,989 19,983
Compensation expense related to share-based compensation plans 9,490 7,402
Contingent consideration adjustment (4,703)  
(Gain) loss on sale of assets (1,458) 360
Gain on Disposition (113,601)  
Changes in operating assets and liabilities:    
Restricted investments (2,454) (3,189)
Accounts receivable, net (44,138) (37,448)
Prepaid taxes 11,918 (11,839)
Prepaid expenses and other current assets 438 (3,059)
Other assets 1,572 (3,505)
Accounts payable 8,070 51,459
Accrued expenses 30,952 (13,179)
Non-current liabilities 4,358 1,419
Transaction costs for Disposition (5,665)  
Net cash provided by operating activities 140,781 87,145
Cash flows from investing activities:    
Proceeds from sale of equipment 4,035 3,052
Purchases of property and equipment (138,847) (39,936)
Acquisitions, net of cash acquired   (165,933)
Proceeds from the disposition of discontinued operations 227,986  
Net cash provided by (used in) investing activities 93,174 (202,817)
Cash flows from financing activities:    
Proceeds from issuance of debt 118,809 73,606
Repayments of long term debt (107,341) (59,921)
Stock tendered for payments of withholding taxes (4,262) (3,410)
Capital lease payments (2,181) (2,101)
Payment of debt issuance costs   (1,397)
Net cash provided by financing activities 5,025 6,777
Effect of exchange rate changes on cash and cash equivalents (30) 49
Net increase (decrease) in cash and cash equivalents 238,950 (108,846)
Cash and cash equivalents beginning of the period 28,557 127,404
Cash and cash equivalents end of the period 267,507 18,558
Supplemental disclosures of cash paid for:    
Interest 6,740 4,033
Income taxes $ 2,759 $ 12,880