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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Cash flows from operating activities    
Net income (loss) $ 19,685 $ (1,640)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Deferred income taxes (2,455) (336)
Depreciation and amortization of property, plant and equipment 20,919 20,152
Stock-based compensation 4,788 1,733
Other (1,215) 159
Cash provided (used) by changes in operating assets and liabilities:    
Accounts receivable 4,745 (13,112)
Inventories (4,322) (338)
Prepaid insurance 3,635 4,229
Supplies, prepaid items and other (1,846) (1,552)
Accounts payable 1,994 (16,836)
Accrued interest 6,470 7,208
Customer deposits 28 10,211
Other assets and other liabilities (629) (3,042)
Net cash provided by operating activities 51,797 6,836
Cash flows from investing activities    
Expenditures for property, plant and equipment (16,976) (20,867)
Proceeds from short-term investments 73,819 64,561
Purchases of short-term investments (105,745) (49,037)
Other investing activities 3,422 72
Net cash used by investing activities (45,480) (5,271)
Cash flows from financing activities    
Payments on other long-term debt   (1,624)
Payments on short-term financing (3,500) (3,971)
Taxes paid on equity awards (1,497) (1,170)
Other financing activities (190)  
Net cash used by financing activities (5,187) (6,765)
Net increase (decrease) in cash and cash equivalents 1,130 (5,200)
Cash and cash equivalents at beginning of period 19,511 20,230
Cash and cash equivalents at end of period $ 20,641 $ 15,030