CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net earnings	$ 243,928	$ 160,943
Adjustments to reconcile net earnings to net cash provided by operations:
Depreciation and amortization	177,777	156,251
Provision for deferred income taxes	38,698	46,441
Amortization of share-based compensation	12,837	12,310
Amortization of major maintenance costs	24,965	21,050
Other	(126)	(8,001)
Increase (decrease) in cash flows resulting from changes in operating assets and liabilities, net	11,031	(64,767)
Net cash provided by operating activities	509,110	324,227
Cash flows from investing activities:
Capital expenditures	(245,990)	(274,963)
Acquisitions of businesses and marine equipment	(65,232)	(37,500)
Proceeds from disposition of assets	13,832	21,846
Net cash used in investing activities	(297,390)	(290,617)
Cash flows from financing activities:
Borrowings (payments) on bank credit facilities, net	(38,893)	100,316
Borrowings on long-term debt	0	240,000
Payments on long-term debt	0	(350,000)
Payment of debt issuance costs	(3)	(1,237)
Proceeds from exercise of stock options	8,375	3,431
Payments related to tax withholding for share-based compensation	(5,356)	(3,598)
Treasury stock purchases	(141,272)	(60,910)
Other	(75)	(73)
Net cash used in financing activities	(177,224)	(72,071)
Increase (decrease) in cash and cash equivalents	34,496	(38,461)
Cash and cash equivalents, beginning of year	32,577	80,577
Cash and cash equivalents, end of period	67,073	42,116
Cash paid (received) during the period:
Interest paid	46,600	45,276
Income taxes paid (refunded), net	15,476	(67,118)
Operating cash outflow from operating leases	34,898	33,266
Non-cash investing activity:
Capital expenditures included in accounts payable	1,729	(2,305)
Right-of-use assets obtained in exchange for lease obligations	$ 38,730	$ 32,652