UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating activities
Net cash (used for) provided by operating activities	$ (9,758)	$ 6,254
Investing activities
Expenditures for property, plant and equipment and acquisition of mineral interests	(14,483)	(7,879)
Proceeds from the sale of property, plant and equipment	11	272
Proceeds from the sale of private company equity units	0	1,153
Other	(163)	(10)
Net cash used for investing activities	(14,635)	(6,464)
Financing activities
Additions to long-term debt	1,327	2,112
Reductions of long-term debt	(1,295)	(1,456)
Net additions to revolving credit agreements	7,000	0
Cash dividends paid	(1,630)	(1,557)
Purchase of treasury shares	(4,274)	0
Net cash provided by (used for) financing activities	1,128	(901)
Cash and cash equivalents
Total decrease for the period	(23,265)	(1,111)
Balance at the beginning of the period	85,109	110,748
Balance at the end of the period	$ 61,844	$ 109,637