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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Cash flows from operating activities    
Net income $ 29,843 $ 8,481
Adjustments to reconcile net income to net cash provided by operating activities:    
Deferred income taxes 967 3,113
Loss on extinguishment of debt 0 59
Depreciation and amortization of property, plant and equipment 65,195 60,143
Stock-based compensation 10,210 5,540
Write-downs of property, plant and equipment 3,826 3,033
Other (486) 1,857
Cash provided (used) by changes in operating assets and liabilities:    
Accounts receivable (238) (7,940)
Inventories (1,924) 4,473
Prepaid insurance 11,107 12,641
Supplies, prepaid items and other (6,412) (1,955)
Accounts payable 6,030 (14,665)
Accrued interest 4,207 4,044
Accrued payroll and benefits 4,220 (1,187)
Other assets and other liabilities 5,111 (62)
Net cash provided by operating activities 131,656 77,575
Cash flows from investing activities    
Expenditures for property, plant and equipment (64,350) (56,325)
Development of carbon capture and sequestration facility (24,108) 0
Proceeds from short-term investments 221,378 211,423
Purchases of short-term investments (257,234) (171,825)
Recovery of property, plant and equipment costs 20,884 0
Other investing activities 3,159 (215)
Net cash used by investing activities (100,271) (16,942)
Cash flows from financing activities    
Proceeds from revolving debt facility 1,350 100
Payments on revolving debt facility (1,350) (100)
Repurchases of 6.25% Senior Secured Notes 0 (32,076)
Payments on other long-term debt (594) (9,024)
Payments on short-term financing (10,686) (10,761)
Proceeds from employee stock purchase program 161 161
Taxes paid on equity awards (2,081) (1,212)
Net cash used by financing activities (13,200) (52,912)
Net increase in cash and cash equivalents 18,185 7,721
Cash and cash equivalents at beginning of period 19,511 20,230
Cash and cash equivalents at end of period $ 37,696 $ 27,951