CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net earnings	$ 286,896	$ 222,905	$ 122,761
Adjustments to reconcile net earnings to net cash provided by operations:
Depreciation and amortization	240,322	211,156	201,443
Provision for doubtful accounts	2,209	402	1,183
Provision for deferred income taxes	31,388	65,298	37,782
Gain on disposition of assets	(2,207)	(5,009)	(8,279)
Impairments	56,303	0	0
Amortization of share-based compensation	15,549	14,941	13,865
Amortization of major maintenance costs	32,572	28,966	29,031
Other	407	(3,338)	(283)
Increase (decrease) in cash flows resulting from changes in:
Accounts receivable	40,458	(50,135)	(31,550)
Inventory	12,146	7,694	(127,095)
Other assets	(18,539)	(37,688)	(27,801)
Income taxes payable	23,787	71,604	1,975
Accounts payable	(11,157)	(18,271)	75,996
Accrued and other liabilities	46,360	31,703	5,100
Net cash provided by operating activities	756,494	540,228	294,128
Cash flows from investing activities:
Capital expenditures	(342,660)	(401,730)	(172,606)
Acquisitions of businesses and marine equipment, net of cash acquired	(77,863)	(37,500)	(3,900)
Proceeds from disposition of assets and other	20,396	26,081	36,905
Net cash used in investing activities	(400,127)	(413,149)	(139,601)
Cash flows from financing activities:
Borrowings (payments) on bank credit facilities, net	(43,842)	48,776	1,358
Borrowings on long-term debt	0	240,000	310,000
Payments on long-term debt	(100,000)	(350,000)	(395,000)
Payment of debt issue costs	(3)	(1,254)	(1,977)
Proceeds from exercise of stock options	9,417	4,209	3,887
Payments related to tax withholding for share-based compensation	(5,398)	(3,908)	(3,408)
Treasury stock purchases	(174,574)	(112,803)	(22,901)
Return of investment to noncontrolling interests and other	(100)	(99)	(722)
Net cash used in financing activities	(314,500)	(175,079)	(108,763)
Increase (decrease) in cash and cash equivalents	41,867	(48,000)	45,764
Cash and cash equivalents, beginning of year	32,577	80,577	34,813
Cash and cash equivalents, end of year	74,444	32,577	80,577
Cash paid (received) during the period:
Interest paid	49,059	49,317	42,816
Income taxes paid (refunded), net	19,567	(65,787)	2,553
Operating cash outflow from operating leases	45,979	43,954	44,229
Non-cash investing activity:
Capital expenditures included in accounts payable	(6,867)	9,567	2,996
Right-of-use assets obtained in exchange for lease obligations	$ 53,551	$ 39,153	$ 22,799