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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash flows from operating activities    
Net (loss) income $ (1,640) $ 5,623
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Deferred income taxes (336) 819
(Gain) on extinguishment of debt   (1,134)
Depreciation expense on the related plant, property and equipment 20,117 17,114
Amortization of short term investments (69) 2,007
Stock-based compensation 1,733 1,394
Write-downs of property, plant and equipment 71 1,455
Other 192 466
Cash provided (used) by changes in operating assets and liabilities:    
Accounts receivable (13,112) (11,408)
Inventories (338) 6,165
Prepaid insurance 4,229 4,078
Supplies, prepaid items and other (1,552) (116)
Accounts payable (16,562) (7,911)
Accrued interest 7,208 7,867
Customer deposits 10,211 1,495
Other assets and other liabilities (3,316) (3,807)
Net cash provided by operating activities 6,836 24,107
Cash flows from investing activities    
Expenditures for property, plant and equipment (20,867) (18,287)
Proceeds from short-term investments 64,561 100,878
Purchases of short-term investments (49,037) (34,689)
Other investing activities 72  
Net cash (used) provided by investing activities (5,271) 47,902
Cash flows from financing activities    
Repurchases of 6.25% Senior Secured Notes   (31,316)
Payments on other long-term debt (1,624) (1,443)
Payments on short-term financing (3,971) (4,379)
Acquisition of treasury stock, net   (5,397)
Taxes paid on equity awards (1,170) (1,766)
Payments of debt-related costs   (217)
Net cash used by financing activities (6,765) (44,518)
Net (decrease) increase in cash and cash equivalents (5,200) 27,491
Cash and cash equivalents at beginning of period 20,230 101,032
Cash and cash equivalents at end of period $ 15,030 $ 128,523