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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Operating Activities    
Net income (loss) $ 33,741 $ (39,587)
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 24,652 29,387
Amortization of deferred financing fees 619 505
Deferred income taxes 1,517 (21,114)
Stock-based compensation 5,832 5,157
(Gain) loss on sale of assets (5,146) 221
Inventory impairment charges 9,643 7,514
Long-lived asset impairment charge 0 65,887
Other (3,971) 968
Working capital changes:    
Accounts receivable (11,725) 2,519
Inventories (27,250) (12,971)
Other current assets (8,677) (1,904)
Accounts payable 1,955 3,148
Income taxes receivable/payable (148) 14,996
Other current liabilities 1,247 (236)
Net cash provided by operating activities 22,289 54,490
Investing Activities    
Expenditures for property, plant and equipment (54,706) (45,408)
Acquisition of mineral interests (713) (36,714)
Proceeds from the sale of assets 822 561
Equity method investment (16,556) (3,464)
Proceeds from the sale of private company equity units 0 3,574
Other (139) (146)
Net cash used for investing activities (71,292) (81,597)
Financing Activities    
Net additions to revolving credit agreement 60,000 10,000
Additions to long-term debt 624 5,232
Reductions to long-term debt (4,914) (4,209)
Debt issuance costs (2,415) 0
Cash dividends paid (6,624) (6,452)
Purchase of treasury shares (9,944) (3,103)
Net cash provided by financing activities 36,727 1,468
Cash and Cash Equivalents    
Total decrease for the year (12,276) (25,639)
Balance at the beginning of the year 85,109 110,748
Balance at the end of the year $ 72,833 $ 85,109