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CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:    
Net earnings (loss) $ (294,007) $ 140,047
Adjustments to reconcile net earnings (loss) to net cash provided by operations:    
Depreciation and amortization 165,067 164,771
Provision for deferred income taxes 5,382 40,502
Impairments and other charges 561,274 0
Amortization of unearned share-based compensation 12,066 11,079
Amortization of major maintenance costs 21,857 17,295
Other 3,523 (5,073)
Increase (decrease) in cash flows resulting from changes in operating assets and liabilities, net (115,399) 18,978
Net cash provided by operating activities 359,763 387,599
Cash flows from investing activities:    
Capital expenditures (129,371) (184,068)
Acquisitions of businesses and marine equipment (348,772) (257,540)
Proceeds from disposition of assets 6,538 34,490
Net cash used in investing activities (471,605) (407,118)
Cash flows from financing activities:    
Borrowings (payments) on bank credit facilities, net 360,139 (417,377)
Borrowings on long-term debt 0 500,000
Payments on long-term debt (150,000) (60,000)
Payments of debt issue costs 0 (2,397)
Proceeds from exercise of stock options 353 3,563
Payments related to tax withholding for share-based compensation (3,193) (2,031)
Other (608) (614)
Net cash provided by financing activities 206,691 21,144
Increase in cash and cash equivalents 94,849 1,625
Cash and cash equivalents, beginning of year 24,737 7,800
Cash and cash equivalents, end of period 119,586 9,425
Cash paid (received) during the period:    
Interest paid 45,776 52,436
Income taxes paid (refunded) (36,499) 3,155
Operating cash outflow from operating leases 32,507 29,424
Non-cash investing activity:    
Capital expenditures included in accounts payable 11,441 6,410
Right-of-use assets obtained in exchange for lease obligations $ 42,470 $ 9,736