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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash Flows from Operating Activities:    
Net income $ 22,995 $ 7,869
Income from discontinued operations, net of tax (13,719) (3,065)
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 19,251 18,802
Accretion of asset retirement obligation 1,553 1,299
Amortization of deferred financing costs 164 151
Stock-based compensation 2,021 2,394
Lower of cost or net realizable value inventory adjustments 1,092 1,754
Impairment of long-lived assets 0 1,866
Gain on disposal of assets (34) (1,422)
Allowance for parts inventory obsolescence 598 2,041
Loss on equity investment 0 888
Equity in loss of unconsolidated entities 11 232
Changes in operating assets and liabilities:    
Trade accounts receivable, net 13,179 (53)
Other receivables, net 72 (1,079)
Inventory, net 6,903 11,418
Prepaid expenses and other current assets 59 809
Accounts payable, accrued liabilities, and accrued employee compensation and benefits (2,042) (1,564)
Operating lease liabilities (499) (490)
Deferred other income (1,128) (1,128)
Other liabilities 4,863 2,167
Net cash provided by operating activities of continuing operations 55,339 42,889
Net cash provided by operating activities of discontinued operations 2,193 7,971
Net cash provided by operating activities 57,532 50,860
Cash Flows from Investing Activities:    
Additions to property, plant, equipment, mineral properties and other assets (13,593) (11,087)
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 (13,584) (6,601)
Net cash provided by investing activities of discontinued operations 60,323 803
Net cash provided by (used in) investing activities 46,739 (5,798)
Cash Flows from Financing Activities:    
Payments of financing lease (869) (500)
Capitalized debt fees (683) 0
Employee tax withholding paid for restricted stock upon vesting (1,271) (856)
Proceeds from exercise of stock options 14 38
Net cash used in financing activities (2,809) (1,318)
Net Change in Cash, Cash Equivalents and Restricted Cash 101,462 43,744
Cash, Cash Equivalents, and Restricted Cash, beginning of period 84,135 41,898
Cash, Cash Equivalents, and Restricted Cash, end of period 185,597 85,642
Supplemental disclosure of cash flow information    
Interest 241 225
Income taxes 119 214
Amounts included in the measurement of operating lease liabilities 589 848
Accrued purchases for property, plant, equipment, and mineral properties 3,652 2,858
Right-of-use assets exchanged for operating lease liabilities 0 2,185
Right-of-use assets exchanged for financing lease liabilities $ 1,063 $ 524