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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Operating activities    
Net cash (used for) provided by operating activities $ (2,879) $ 63,020
Investing activities    
Expenditures for property, plant and equipment and acquisition of mineral interests (30,697) (37,894)
Proceeds from the sale of property, plant and equipment 416 323
Proceeds from the sale of private company equity units 0 1,153
Other (774) (1,137)
Net cash used for investing activities (31,055) (37,555)
Financing activities    
Additions to long-term debt 3,090 790
Reductions of long-term debt (3,894) (3,186)
Net additions to revolving credit agreements 27,221 0
Cash dividends paid (4,964) (4,826)
Purchase of treasury shares (9,576) (824)
Net cash provided by (used for) financing activities 11,877 (8,046)
Cash and cash equivalents    
Total (decrease) increase for the period (22,057) 17,419
Balance at the beginning of the period 85,109 110,748
Balance at the end of the period $ 63,052 $ 128,167