UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Operating activities
Net cash provided by (used for) operating activities	$ 39,502	$ (2,879)
Investing activities
Expenditures for property, plant and equipment and acquisition of mineral interests	(34,342)	(30,697)
Proceeds from the sale of property, plant and equipment	392	416
Other	1,140	(774)
Net cash used for investing activities	(32,810)	(31,055)
Financing activities
Additions to long-term debt	2,768	3,090
Reductions of long-term debt	(3,489)	(3,894)
Net (reductions) additions to revolving credit agreements	(20,000)	27,221
Cash dividends paid	(5,452)	(4,964)
Purchase of treasury shares	(695)	(9,576)
Net cash (used for) provided by financing activities	(26,868)	11,877
Cash and cash equivalents
Total decrease for the period	(20,176)	(22,057)
Balance at the beginning of the period	72,833	85,109
Balance at the end of the period	$ 52,657	$ 63,052