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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Cash Flows from Operating Activities:    
Net income $ 24,727 $ 11,614
Income from discontinued operations, net of tax (13,719) (6,081)
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 28,351 27,645
Accretion of asset retirement obligation 2,329 1,948
Amortization of deferred financing costs 226 226
Stock-based compensation 3,553 3,774
Lower of cost or net realizable value inventory adjustments 1,339 2,160
Impairment of long-lived assets 0 1,866
Loss (gain) on disposal of assets 40 (1,420)
Allowance for parts inventory obsolescence 601 2,335
Loss on equity investment 0 888
Equity in loss of unconsolidated entities 13 318
Changes in operating assets and liabilities:    
Trade accounts receivable, net 5,557 (4,036)
Other receivables, net (191) (2,432)
Inventory, net (3,904) (1,256)
Prepaid expenses and other current assets (1,741) (1,591)
Accounts payable, accrued liabilities, and accrued employee compensation and benefits 1,180 4,460
Operating lease liabilities (743) (847)
Deferred other income (1,692) (1,692)
Other liabilities 4,620 (558)
Net cash provided by operating activities of continuing operations 50,546 37,321
Net cash provided by operating activities of discontinued operations 2,368 9,552
Net cash provided by operating activities 52,914 46,873
Cash Flows from Investing Activities:    
Additions to property, plant, equipment, mineral properties and other assets (24,897) (18,835)
Payments to Acquire Investments (14,530) 0
Proceeds from sale of assets 9 1,357
Proceeds from redemptions/maturities of investments 0 1,000
Other investing, net 0 2,129
Net cash used in investing activities of continuing operations (39,418) (14,349)
Net cash provided by investing activities of discontinued operations 59,169 3,164
Net cash provided by (used in) investing activities 19,751 (11,185)
Cash Flows from Financing Activities:    
Payments of financing lease (982) (735)
Capitalized debt fees (811) 0
Employee tax withholding paid for restricted stock upon vesting (1,304) (890)
Repurchases of common stock (822) 0
Proceeds from exercise of stock options 14 1,842
Net cash (used in) provided by financing activities (3,905) 217
Net Change in Cash, Cash Equivalents and Restricted Cash 68,760 35,905
Cash, Cash Equivalents, and Restricted Cash, beginning of period 84,135 41,898
Cash, Cash Equivalents, and Restricted Cash, end of period 152,895 77,803
Supplemental disclosure of cash flow information    
Interest 343 324
Income taxes 211 246
Amounts included in the measurement of operating lease liabilities 870 1,266
Accrued purchases for property, plant, equipment, and mineral properties 3,650 1,753
Right-of-use assets exchanged for operating lease liabilities 0 2,185
Right-of-use assets exchanged for financing lease liabilities $ 1,063 $ 1,380