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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities      
Net (loss) income $ (19,353) $ 27,923 $ 230,347
Adjustments to reconcile net (loss) income to net cash provided by operating activities:      
Deferred income taxes (6,945) 5,366 36,854
Depreciation and amortization of property, plant and equipment 74,277 68,414 66,937
Write-downs of property, plant and equipment 11,703 3,613 1,219
Stock-based compensation 6,607 5,353 4,025
Amortization of short-term investments 4,046 (2,289) (3,341)
Amortization of debt issuance costs, including discounts and premiums 1,621 1,924 2,073
(Gain) loss on extinguishments of debt (3,013) (8,644) 113
Other 990 344 (1,434)
Cash provided (used) by changes in assets and liabilities:      
Accounts receivable, net 1,619 35,113 10,197
Inventories 2,946 2,755 (14,300)
Supplies, prepaid items and other (1,215) 5,528 (8,548)
Accounts payable 13,390 (264) 18,821
Other assets and other liabilities (97) (7,615) 2,691
Net cash provided by operating activities 86,576 137,521 345,654
Cash flows from investing activities      
Expenditures for property, plant and equipment (92,294) (67,603) (45,833)
Proceeds from short-term investments 310,329 389,856 158,879
Purchases of short-term investments (270,912) (264,448) (486,091)
Other investing activities (203) (405) 3,310
Net cash provided (used) by investing activities (53,080) 57,400 (369,735)
Cash flows from financing activities      
Proceeds from 6.25% senior secured notes     200,000
Repurchases or Payments on senior secured notes (92,216) (114,320)  
Payments on other long-term debt (6,045) (9,536) (13,750)
Payments of debt-related costs, including extinguishment costs (705) (94) (4,840)
Proceeds from short-term financing 16,144 17,805 20,143
Payments on short-term financing (17,396) (20,542) (16,725)
Acquisition of treasury stock, net (11,904) (28,305) (174,975)
Taxes paid on equity awards (2,176) (2,666) (4,012)
Payments of costs to exchange redeemable preferred stocks for common stock     (135)
Net cash (used) provided by financing activities (114,298) (157,658) 5,706
Net (decrease) increase in cash, cash equivalents and restricted cash (80,802) 37,263 (18,375)
Cash, cash equivalents and restricted cash at beginning of year 101,032 63,769 82,144
Cash, cash equivalents and restricted cash at end of year $ 20,230 $ 101,032 $ 63,769