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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Operating activities    
Net cash provided by operating activities $ 63,020 $ 54,929
Investing activities    
Expenditures for property, plant and equipment and acquisition of mineral interests (37,894) (42,004)
Proceeds from the sale of property, plant and equipment 323 2,824
Proceeds from the sale of private company equity units 1,153 0
Other (1,137) (58)
Net cash used for investing activities (37,555) (39,238)
Financing activities    
Additions to long-term debt 790 1,664
Reductions of long-term debt (3,186) (2,118)
Net reductions to revolving credit agreements 0 (4,000)
Cash dividends paid (4,826) (4,488)
Purchase of treasury shares (824) 0
Net cash used for financing activities (8,046) (8,942)
Cash and cash equivalents    
Total increase for the period 17,419 6,749
Balance at the beginning of the period 110,748 86,005
Balance at the end of the period $ 128,167 $ 92,754