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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net loss $ (257,920) $ (294,007)
Adjustments to reconcile net loss to net cash provided by operations    
Depreciation and amortization 163,484 165,067
Provision (benefit) for deferred income taxes (56,448) 5,382
Impairments and other charges 340,713 561,274
Amortization of unearned share-based compensation 12,793 12,066
Amortization of major maintenance costs 26,189 21,857
Other (6,290) 3,523
Increase (decrease) in cash flows resulting from changes in operating assets and liabilities, net 57,841 (115,399)
Net cash provided by operating activities 280,362 359,763
Cash flows from investing activities:    
Capital expenditures (71,968) (129,371)
Acquisitions of businesses and marine equipment (7,470) (348,772)
Proceeds from disposition of assets 39,163 6,538
Net cash used in investing activities (40,275) (471,605)
Cash flows from financing activities:    
Borrowings (payments) on bank credit facilities, net (248,057) 360,139
Payments on long-term debt (15,000) (150,000)
Proceeds from exercise of stock options 629 353
Payments related to tax withholding for share-based compensation (2,856) (3,193)
Return of investment to noncontrolling interest (764) (608)
Net cash provided by (used in) financing activities (266,048) 206,691
Increase (decrease) in cash and cash equivalents (25,961) 94,849
Cash and cash equivalents, beginning of year 80,338 24,737
Cash and cash equivalents, end of period 54,377 119,586
Cash paid (received) during the period:    
Interest paid 39,134 45,776
Income taxes refunded, net (116,010) (36,499)
Operating cash outflow from operating leases 33,575 32,507
Non-cash investing activity:    
Capital expenditures included in accounts payable (13,549) 11,441
Right-of-use assets obtained in exchange for lease obligations $ 18,117 $ 42,470