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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net Income (Loss) $ 138,743 $ 277,674
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 136,775 111,413
Impairment of right-of-use asset 2,012 5,361
Deferred taxes 18,832 (1,427)
Compensation expense related to share-based compensation plans 16,031 14,973
Gain on sale of assets (5,599) (21,097)
Changes in operating assets and liabilities:    
Restricted investments (1,744) 7,368
Accounts receivable, net 83,664 (55,994)
Prepaid taxes (2,108) (1,408)
Prepaid expenses and other current assets 6,161 6,818
Other assets (2,515) (3,381)
Accounts payable 516 (21,169)
Accrued expenses (46,243) 41,165
Non-current liabilities (21,848) (9,825)
Net cash provided by operating activities 322,677 350,471
Cash flows from investing activities:    
Proceeds from sale of equipment 20,208 33,994
Purchases of property and equipment (105,667) (157,664)
Cash provided by (used in) acquisitions 108 (102,661)
Net cash used in investing activities (85,351) (226,331)
Cash flows from financing activities:    
Purchase of treasury stock (117,352) (75,000)
Repayments of long-term debt (80,965) (81,905)
Stock withheld for payments of withholding taxes (8,003) (5,778)
Finance lease payments (2,097) (1,582)
Proceeds from issuance of debt 85,107 127,017
Purchase of treasury stock from related party 0 (34,767)
Net cash used in financing activities (123,310) (72,015)
Effect of exchange rate changes on cash and cash equivalents 28 12
Net increase in cash and cash equivalents 114,044 52,137
Cash and cash equivalents beginning of the period 286,642 159,784
Cash and cash equivalents end of the period 400,686 211,921
Supplemental disclosures of cash paid for:    
Interest 9,547 5,840
Income taxes $ 23,260 $ 96,165