CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Cash flows from operating activities:
Net income	$ 54,715	$ 21,531
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	38,639	38,264
(Gain) loss on disposal of assets	(177)	261
Deferred income taxes	6,646	751
Stock-based compensation	4,287	4,404
Amortization of deferred financing fees	309	309
Operational asset adjustments	0	1,200
Changes in assets and liabilities, net of business acquisitions:
Accounts and other receivables	(13,994)	(6,004)
Inventories	(9,378)	36,004
Taxes receivable	(14,740)	1,255
Accounts payable	12,423	(61,681)
Income taxes payable	(663)	(7,026)
Accrued liabilities	561	6,149
Deferred income and customer advances	(35,680)	(14,530)
Other assets and liabilities	(10,395)	(6,889)
Net cash provided by operating activities	32,553	13,998
Cash flows from investing activities:
Expenditures for property, plant and equipment	(62,327)	(68,883)
Other investing activities	(5,891)	(3,736)
Net cash used for investing activities	(68,218)	(72,619)
Cash flows from financing activities:
Borrowings from line of credit	231,500	257,500
Repayments of line of credit	(186,500)	(197,500)
Principal payments of finance leases	(491)	(502)
Dividend payments	(8,580)	(8,582)
Purchase of treasury stock	(1,537)	(10,385)
Issuance of common stock	155	427
Net cash provided by financing activities	34,547	40,958
Net change in cash and cash equivalents	(1,118)	(17,663)
Cash and cash equivalents at beginning of period	19,564	29,768
Cash and cash equivalents at the end of period	18,446	12,105
Supplemental non-cash investing activities:
Capital expenditures included in accounts payable	14,762	14,932
Supplemental cash activities:
Cash paid for interest	2,297	6,015
Cash paid for income taxes	$ 15,080	$ 13,587