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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Operating Activities    
Net income $ 74,158 $ 48,125
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 26,816 23,085
Amortization of deferred financing fees 446 326
Deferred income taxes (8,471) (3,553)
Stock-based compensation 7,541 5,561
Gain on sale of assets (2,463) (60)
Contract termination settlement (15,552) 0
Asset impairment charges 3,939 0
Other (791) 1,647
Working capital changes:    
Affiliates receivable/payable 0 495
Accounts receivable (13,224) (13,685)
Inventories (6,834) (6,534)
Other current assets 1,308 3,320
Accounts payable 252 7,445
Income taxes receivable/payable (416) 2,699
Other current liabilities 1,026 6,004
Net cash provided by operating activities 67,735 74,875
Investing Activities    
Expenditures for property, plant and equipment (42,523) (39,230)
Acquisition of mineral interests (11,924) (5,331)
Proceeds from the sale of assets 2,837 633
Proceeds from the sale of private company equity units 18,628 0
Other (170) (219)
Net cash used for investing activities (33,152) (44,147)
Financing Activities    
Net reductions to revolving credit agreement (4,000) (26,000)
Additions to long-term debt 3,091 3,634
Reductions to long-term debt (2,919) (3,435)
Cash dividends paid (6,012) (5,617)
Other 0 (1,755)
Net cash used for financing activities (9,840) (33,173)
Cash and Cash Equivalents    
Total increase (decrease) for the year 24,743 (2,445)
Balance at the beginning of the year 86,005 88,450
Balance at the end of the year $ 110,748 $ 86,005