CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net earnings	$ 40,621	$ 17,586
Adjustments to reconcile net earnings to net cash provided by operations:
Depreciation and amortization	51,109	49,964
Provision for deferred income taxes	12,573	5,856
Amortization of share-based compensation	5,808	5,965
Amortization of major maintenance costs	6,992	7,113
Other	(2,302)	(3,480)
Decrease in cash flows resulting from changes in operating assets and liabilities, net	(98,321)	(50,782)
Net cash provided by operating activities	16,480	32,222
Cash flows from investing activities:
Capital expenditures	(73,199)	(35,075)
Acquisitions of businesses	0	(3,900)
Proceeds from disposition of assets	8,031	14,280
Net cash used in investing activities	(65,168)	(24,695)
Cash flows from financing activities:
Borrowings on bank credit facilities, net	112,691	1,163
Borrowings on long-term debt	240,000	0
Payments on long-term debt	(350,000)	(10,000)
Payment of debt issuance costs	(1,236)	0
Proceeds from exercise of stock options	118	2,336
Payments related to tax withholding for share-based compensation	(3,555)	(3,093)
Treasury stock purchases	(3,184)	0
Return of investment to noncontrolling interest and other	(24)	(348)
Net cash used in financing activities	(5,190)	(9,942)
Decrease in cash and cash equivalents	(53,878)	(2,415)
Cash and cash equivalents, beginning of year	80,577	34,813
Cash and cash equivalents, end of period	26,699	32,398
Cash paid (received) during the period:
Interest paid	20,293	18,022
Income taxes paid (refunded), net	694	(24)
Operating cash outflow from operating leases	10,451	11,040
Non-cash investing activity:
Capital expenditures included in accounts payable	(8,197)	(487)
Right-of-use assets obtained in exchange for lease obligations	$ 10,768	$ 6,464