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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities    
Net income (loss) $ 8,481 $ (10,204)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Deferred income taxes 3,113 (2,880)
Loss (gain) on extinguishment of debt 59 (3,013)
Depreciation expense on the related plant, property and equipment 60,143 52,484
Amortization of short term investments 357 4,528
Stock-based compensation 5,540 5,042
Write-downs of property, plant and equipment 3,033 8,582
Other 1,857 2,310
Cash provided (used) by changes in operating assets and liabilities:    
Accounts receivable (7,940) (3,890)
Inventories 4,473 6,604
Prepaid insurance 12,641 12,832
Supplies, prepaid items and other (1,955) (842)
Accounts payable (15,206) 6,995
Accrued interest 4,044 3,634
Other assets and other liabilities (1,065) 418
Net cash provided by operating activities 77,575 82,600
Cash flows from investing activities    
Expenditures for property, plant and equipment (56,325) (64,087)
Proceeds from short-term investments 211,423 236,493
Purchases of short-term investments (171,825) (190,646)
Other investing activities (215) (140)
Net cash used by investing activitie (16,942) (18,380)
Cash flows from financing activities    
Proceeds from revolving debt facility 100 0
Payments on revolving debt facility (100) 0
Repurchases of 6.25% Senior Secured Notes (32,076) (92,216)
Payments on other long-term debt (9,024) (3,986)
Payments on short-term financing (10,761) (11,870)
Acquisition of treasury stock, net 160 (12,032)
Taxes paid on equity awards (1,211) (2,176)
Payments of debt-related costs 0 (689)
Net cash used by financing activities (52,912) (122,969)
Net increase (decrease) in cash and cash equivalents 7,721 (58,749)
Cash and cash equivalents at beginning of period 20,230 101,032
Cash and cash equivalents at end of period $ 27,951 $ 42,283