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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income $ 201,740 $ 135,153 $ 74,805
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 83,910 62,173 44,712
Deferred taxes 39,499 (41,351) 13,801
Compensation expense related to share-based compensation plans 13,480 9,873 8,479
Contingent consideration adjustment (4,703)    
(Gain) loss on sale of assets (1,007) 441 (573)
Excess tax benefits from share based compensation     (733)
Gain on Disposition (132,448)    
Transaction costs for Disposition (5,798)    
Changes in operating assets and liabilities:      
Restricted investments 827 (3,304) 231
Accounts receivable, net (31,475) (84,775) (87,629)
Prepaid taxes 11,472 (11,794) 66
Prepaid expenses and other current assets (1,750) (7,543) 1,099
Other assets (8,029) 56 570
Accounts payable 5,521 59,037 35,709
Accrued expenses 43,476 (2,931) 9,238
Non-current liabilities (3,876) 10,185 2,698
Net cash provided by operating activities 210,839 125,220 102,473
Cash flows from investing activities:      
Proceeds from sale of equipment 10,975 5,327 2,061
Purchases of property and equipment (199,791) (74,541) (107,409)
Acquisitions, net of cash acquired (248,656) (165,933)  
Proceeds from the disposition of discontinued operations 227,986    
Net cash used in investing activities (209,486) (235,147) (105,348)
Cash flows from financing activities:      
Proceeds from issuance of debt 172,146 98,544 62,155
Repayments of long-term debt (133,436) (79,869) (34,767)
Stock tendered for payments of withholding taxes (4,270) (3,412) (2,489)
Purchase of treasury stock     (100,000)
Capital lease payments (2,889) (2,800) (2,634)
Excess tax benefits from share based compensation     372
Payment of debt issuance costs   (1,397)  
Net cash provided by (used in) financing activities 31,551 11,066 (77,363)
Effect of exchange rate changes on cash and cash equivalents (26) 14 (107)
Net increase (decrease) in cash and cash equivalents 32,878 (98,847) (80,345)
Cash and cash equivalents beginning of the year 28,557 127,404 207,749
Cash and cash equivalents end of the year 61,435 28,557 127,404
Supplemental disclosures of cash paid for:      
Interest 9,677 6,162 3,665
Income taxes $ 13,606 $ 13,149 $ 33,233