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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash flows from operating activities    
Net income $ 13,496 $ 1,366
Adjustments to reconcile net income to net cash provided by operating activities:    
Deferred income taxes (4,248) 711
Loss on extinguishment of debt 0 59
Depreciation and amortization of property, plant and equipment 42,865 40,765
Stock-based compensation 7,667 3,821
Write-downs of property, plant and equipment 327 2,599
Other 190 1,578
Cash provided (used) by changes in operating assets and liabilities:    
Accounts receivable 4,552 (12,564)
Inventories 3,035 190
Prepaid insurance 7,045 8,420
Supplies, prepaid items and other 2,526 (2,937)
Accounts payable 29,702 (15,967)
Accrued interest (2,284) (2,745)
Other assets and other liabilities 6,281 (295)
Net cash provided by operating activities 111,154 25,001
Cash flows from investing activities    
Expenditures for property, plant and equipment (46,241) (39,347)
Development of carbon capture and sequestration facility (10,819) 0
Proceeds from short-term investments 147,665 154,565
Purchases of short-term investments (215,777) (110,281)
Recovery of property, plant and equipment costs 20,884 0
Other investing activities 3,335 (111)
Net cash (used) provided by investing activities (100,953) 4,826
Cash flows from financing activities    
Repurchases of 6.25% Senior Secured Notes 0 (32,076)
Payments on other long-term debt 0 (3,004)
Payments on short-term financing (7,062) (8,019)
Acquisition of treasury stock, net 161 157
Taxes paid on equity awards (2,081) (1,182)
Other financing activities (374) (319)
Net cash used by financing activities (9,356) (44,443)
Net increase (decrease) in cash and cash equivalents 845 (14,616)
Cash and cash equivalents at beginning of period 19,511 20,230
Cash and cash equivalents at end of period $ 20,356 $ 5,614