Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 26, 2025	Sep. 27, 2024
Cash flows from operating activities:
Net income	$ 68,250	$ 54,739
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, and amortization	51,551	51,291
Amortization of deferred financing costs in interest expense	1,647	1,286
Stock-based compensation expense (non-cash)	8,520	7,715
Deferred income tax expense (benefit)	(43)	(9)
Changes in assets and liabilities:
Accounts receivable	1,701	(21,921)
Inventory	(21,980)	(34,215)
Prepaid and other current assets	(21,089)	(24,646)
Accounts payable and accrued expenses	21,532	3,704
Unearned revenue	(13,142)	(17,568)
Interest and taxes payable	(1,550)	(3,233)
Other-net	(11,673)	(5,579)
Net cash provided by operating activities	83,724	11,564
Cash flows from investing activities:
Payments for purchase of property, plant, and equipment	(38,741)	(50,730)
Payments for mine development	(19,952)	(10,376)
Proceeds from sale of property, plant, and equipment	932	561
Payments for acquisition, net of cash acquired	(19,500)	0
Net cash used in investing activities	(77,261)	(60,545)
Cash flows from financing activities:
Proceeds from borrowings under credit facilities, net	30,574	91,057
Repayment of long-term debt	(16,609)	(22,694)
Principal payments under finance lease obligations	(456)	(567)
Cash dividends paid	(8,608)	(8,295)
Deferred financing costs	(2,935)	0
Repurchase of common stock	(7,843)	0
Payments of withholding taxes for stock-based compensation awards	(2,540)	(6,575)
Net cash provided by financing activities	(8,417)	52,926
Effects of exchange rate changes	1,652	635
Net change in cash and cash equivalents	(302)	4,580
Cash and cash equivalents at beginning of period	16,713	13,294
Cash and cash equivalents at end of period	$ 16,411	$ 17,874