CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net earnings	$ 153,897	$ 97,939
Adjustments to reconcile net earnings to net cash provided by operations:
Depreciation and amortization	117,124	102,806
Provision for deferred income taxes	23,926	30,238
Amortization of share-based compensation	9,399	8,912
Amortization of major maintenance costs	16,755	14,043
Other	915	(3,111)
Decrease in cash flows resulting from changes in operating assets and liabilities, net	(19,409)	(22,878)
Net cash provided by operating activities	302,607	227,949
Cash flows from investing activities:
Capital expenditures	(169,607)	(171,245)
Acquisitions of businesses and marine equipment	(65,232)	0
Proceeds from disposition of assets	9,054	20,529
Net cash used in investing activities	(225,785)	(150,716)
Cash flows from financing activities:
Borrowings on bank credit facilities, net	30,902	31,155
Borrowings on long-term debt	0	240,000
Payments on long-term debt	0	(350,000)
Payment of debt issuance costs	(3)	(1,236)
Proceeds from exercise of stock options	4,096	118
Payments related to tax withholding for share-based compensation	(5,339)	(3,595)
Treasury stock purchases	(85,466)	(37,600)
Other	(49)	(49)
Net cash used in financing activities	(55,859)	(121,207)
Increase (decrease) in cash and cash equivalents	20,963	(43,974)
Cash and cash equivalents, beginning of year	32,577	80,577
Cash and cash equivalents, end of period	53,540	36,603
Cash paid (received) during the period:
Interest paid	26,243	24,553
Income taxes paid (refunded), net	14,391	(67,921)
Operating cash outflow from operating leases	22,980	22,769
Non-cash investing activity:
Capital expenditures included in accounts payable	(2,015)	(5,064)
Right-of-use assets obtained in exchange for lease obligations	$ 21,045	$ 20,838