CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net earnings	$ 46,192	$ 7,232
Adjustments to reconcile net earnings to net cash provided by operations:
Depreciation and amortization	100,079	110,022
Provision for deferred income taxes	15,335	4,380
Amortization of share-based compensation	8,555	9,148
Amortization of major maintenance costs	14,405	17,082
Other	(6,412)	(4,309)
Increase (decrease) in cash flows resulting from changes in operating assets and liabilities, net	(82,510)	54,263
Net cash provided by operating activities	95,644	197,818
Cash flows from investing activities:
Capital expenditures	(79,059)	(38,369)
Acquisitions of businesses and marine equipment	(3,900)	(7,470)
Proceeds from disposition of assets	23,311	16,731
Net cash used in investing activities	(59,648)	(29,108)
Cash flows from financing activities:
Borrowings (payments) on bank credit facilities, net	2,272	(193,623)
Payments on long-term debt	(30,000)	0
Proceeds from exercise of stock options	3,885	505
Payments related to tax withholding for share-based compensation	(3,192)	(2,853)
Treasury stock purchases	(18,085)	0
Return of investment to noncontrolling interest and other	(585)	(25)
Net cash used in financing activities	(45,705)	(195,996)
Decrease in cash and cash equivalents	(9,709)	(27,286)
Cash and cash equivalents, beginning of year	34,813	80,338
Cash and cash equivalents, end of period	25,104	53,052
Cash paid (received) during the period:
Interest paid	20,161	20,913
Income taxes refunded, net	1,190	(116,451)
Operating cash outflow from operating leases	22,287	21,996
Non-cash investing activity:
Capital expenditures included in accounts payable	(3,655)	(18,401)
Right-of-use assets obtained in exchange for lease obligations	$ 10,290	$ 7,413