CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net earnings (loss)	$ 85,436	$ (257,920)
Adjustments to reconcile net earnings (loss) to net cash provided by operations:
Depreciation and amortization	150,498	163,484
Provision (benefit) for deferred income taxes	25,986	(56,448)
Impairments	0	340,713
Amortization of share-based compensation	11,448	12,793
Amortization of major maintenance costs	21,677	26,189
Other	(7,608)	(6,290)
Increase (decrease) in cash flows resulting from changes in operating assets and liabilities, net	(126,252)	57,841
Net cash provided by operating activities	161,185	280,362
Cash flows from investing activities:
Capital expenditures	(120,263)	(71,968)
Acquisitions of businesses and marine equipment	(3,900)	(7,470)
Proceeds from disposition of assets	32,904	39,163
Net cash used in investing activities	(91,259)	(40,275)
Cash flows from financing activities:
Borrowings (payments) on bank credit facilities, net	21,664	(248,057)
Borrowings on long-term debt	250,000	0
Payments on long-term debt	(315,000)	(15,000)
Payment of debt issuance costs	(1,538)	0
Proceeds from exercise of stock options	3,885	629
Payments related to tax withholding for share-based compensation	(3,193)	(2,856)
Treasury stock purchases	(22,901)	0
Return of investment to noncontrolling interest and other	(665)	(764)
Net cash used in financing activities	(67,748)	(266,048)
Increase (decrease) in cash and cash equivalents	2,178	(25,961)
Cash and cash equivalents, beginning of year	34,813	80,338
Cash and cash equivalents, end of period	36,991	54,377
Cash paid (received) during the period:
Interest paid	39,754	39,134
Income taxes refunded, net	2,097	(116,010)
Operating cash outflow from operating leases	33,412	33,575
Non-cash investing activity:
Capital expenditures included in accounts payable	(8,508)	(13,549)
Right-of-use assets obtained in exchange for lease obligations	$ 14,329	$ 18,117