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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net earnings (loss) $ 7,232 $ (321,700)
Adjustments to reconcile net earnings (loss) to net cash provided by operations    
Depreciation and amortization 110,022 110,288
Provision (benefit) for deferred income taxes 4,380 (18,588)
Impairments and other charges 0 561,274
Amortization of unearned share-based compensation 9,148 8,652
Amortization of major maintenance costs 17,082 14,473
Other (4,309) 3,513
Increase (decrease) in cash flows resulting from changes in operating assets and liabilities, net 54,263 (115,768)
Net cash provided by operating activities 197,818 242,144
Cash flows from investing activities:    
Capital expenditures (38,369) (92,830)
Acquisitions of businesses and marine equipment (7,470) (342,247)
Proceeds from disposition of assets 16,731 4,918
Net cash used in investing activities (29,108) (430,159)
Cash flows from financing activities:    
Borrowings (payments) on bank credit facilities, net (193,623) 424,991
Payments on long-term debt 0 (150,000)
Proceeds from exercise of stock options 505 353
Payments related to tax withholding for share-based compensation (2,853) (3,191)
Return of investment to noncontrolling interest (25) (404)
Net cash provided by (used in) financing activities (195,996) 271,749
Increase (decrease) in cash and cash equivalents (27,286) 83,734
Cash and cash equivalents, beginning of year 80,338 24,737
Cash and cash equivalents, end of period 53,052 108,471
Cash paid (received) during the period:    
Interest paid 20,913 26,265
Income taxes refunded, net (116,451) (37,704)
Operating cash outflow from operating leases 21,996 21,323
Non-cash investing activity:    
Capital expenditures included in accounts payable (18,401) 4,936
Right-of-use assets obtained in exchange for lease obligations $ 7,413 $ 38,754