CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net income	$ 21,531	$ 67,682
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	38,264	35,958
Loss on disposal of assets	261	568
Deferred income taxes	751	3,894
Stock-based compensation	4,404	4,449
Amortization of deferred financing fees	309	309
Operational asset adjustments	1,200	0
Changes in assets and liabilities, net of business acquisitions:
Accounts and other receivables	(6,004)	22,123
Inventories	36,004	(10,484)
Taxes receivable	1,255	8,329
Accounts payable	(61,681)	(45,878)
Income taxes payable	(7,026)	(1,338)
Accrued liabilities	6,149	(5,744)
Deferred income and customer advances	(14,530)	(32,097)
Other assets and liabilities	(6,889)	(11,192)
Net cash provided by operating activities	13,998	36,579
Cash flows from investing activities:
Expenditures for property, plant and equipment	(68,883)	(43,894)
Other investing activities	(3,736)	(2,034)
Net cash used for investing activities	(72,619)	(45,928)
Cash flows from financing activities:
Borrowings from line of credit	257,500	230,500
Payments of line of credit	(197,500)	(205,500)
Principal payments of finance leases	(502)	(456)
Dividend payments	(8,582)	(8,004)
Purchase of treasury stock	(10,385)	(28,385)
Issuance of common stock	427	745
Net cash provided by (used for) financing activities	40,958	(11,100)
Net change in cash and cash equivalents	(17,663)	(20,449)
Cash and cash equivalents at beginning of period	29,768	30,985
Cash and cash equivalents at the end of period	12,105	10,536
Supplemental non-cash investing activities:
Capital expenditures included in accounts payable	14,932	9,832
Supplemental cash activities:
Cash paid for interest	6,015	3,027
Cash paid for income taxes	$ 13,587	$ 7,024