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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:      
Net income $ 73,559 $ 107,171 $ 201,740
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 123,679 116,887 83,910
Deferred taxes 7,463 1,821 39,499
Compensation expense related to share-based compensation plans 17,053 16,286 13,480
Contingent consideration adjustment     (4,703)
Loss (gain) on sale of assets 907 (745) (1,007)
Other operating activities 6,385    
Gain on Disposition     (132,448)
Transaction costs for Disposition     (5,798)
Changes in operating assets and liabilities, net of acquisitions:      
Restricted investments (752) (3,365) 827
Accounts receivable, net (47,219) 32,732 (31,475)
Prepaid taxes (707) (14) 11,472
Prepaid expenses and other current assets (2,508) 3,447 (1,750)
Other assets (2,177) (3,786) (8,029)
Accounts payable 5,594 (14,933) 5,521
Accrued expenses (4,408) (122) 43,476
Non-current liabilities (1,915) (870) (3,876)
Net cash provided by operating activities 174,954 254,509 210,839
Cash flows from investing activities:      
Proceeds from sale of equipment 3,289 10,025 10,975
Purchases of property and equipment (115,306) (94,847) (199,791)
Acquisitions, net of cash acquired (84,845) (734) (248,656)
Proceeds from the disposition of discontinued operations   19,439 227,986
Net cash used in investing activities (196,862) (66,117) (209,486)
Cash flows from financing activities:      
Proceeds from issuance of debt 187,475 56,494 172,146
Repayments of long-term debt (198,741) (105,653) (133,436)
Stock tendered for payments of withholding taxes (7,963) (3,984) (4,270)
Purchase of treasury stock   (24,998)  
Finance lease payments (3,066) (2,954) (2,889)
Net cash (used in) provided by financing activities (22,295) (81,095) 31,551
Effect of exchange rate changes on cash and cash equivalents (20) (3) (26)
Net (decrease) increase in cash and cash equivalents (44,223) 107,294 32,878
Cash and cash equivalents beginning of the year 168,729 61,435 28,557
Cash and cash equivalents end of the year 124,506 168,729 61,435
Supplemental disclosures of cash paid for:      
Interest 9,458 11,262 9,677
Income taxes $ 18,388 $ 40,289 $ 13,606