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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating activities      
Net loss $ (38,707) $ (101,835) $ (14,919)
Adjustments to reconcile net loss to cash provided by operating activities:      
Income from discontinued operations (3,217) (312) (12,458)
Depreciation and amortization 137,173 139,983 134,576
Asset impairment 25,169 62,300 0
Stock-based compensation expense 7,101 6,507 9,650
Amortization of debt discount and issuance costs 8,559 6,050 4,033
Deferred income tax benefit (9,606) (27,713) (3,948)
Increase in environmental liabilities 6,417 4,764 4,595
Gain on GreenFirst equity securities 0 0 (5,197)
(Gain) loss on debt extinguishment 4,363 (361) (651)
Net periodic benefit cost of pension and other postretirement plans 2,268 3,578 5,290
Unrealized (gain) loss on foreign currency (5,613) 1,900 (5,666)
Loss on disposal of property, plant and equipment 1,790 731 3,742
Changes in operating assets and liabilities:      
Accounts receivable (24,392) 19,979 (33,824)
Inventories (2,134) 58,949 (35,113)
Income tax receivable 19,859 (7,137) 19,795
Accounts payable 8,068 13,757 (8,266)
Accrued and other current liabilities 20,505 (12,219) 27,909
Duty refund rights 40,111 (1,946) (17,760)
Other 20,315 (13,783) 9,401
Contributions to pension and other postretirement plans (8,514) (11,533) (7,915)
Expenditures for environmental liabilities (5,905) (5,385) (4,461)
Cash provided by operating activities 203,610 136,274 68,813
Cash provided by operating activities 203,610 136,274 68,813
Investing activities      
Capital expenditures, net of proceeds (107,944) (127,670) (138,223)
Investment in equity method investment 0 (780) (379)
Cash used in investing activities-continuing operations (107,944) (128,450) (138,602)
Cash provided by investing activities-discontinued operations 0 1,169 44,428
Cash used in investing activities (107,944) (127,281) (94,174)
Financing activities      
Borrowings of long-term debt 672,200 465,030 5,721
Repayments of long-term debt (701,885) (537,845) (75,250)
Short-term financing, net (2,740) 1,369 (3,153)
Debt issuance costs (23,790) (10,082) 0
Repurchase of common stock (914) (5,419) (433)
Contribution from redeemable noncontrolling interest 15,843 0 0
Preferred equity issuance costs (1,192) 0 0
Cash used in financing activities (42,478) (86,947) (73,115)
Net increase (decrease) in cash and cash equivalents 53,188 (77,954) (98,476)
Net effect of foreign exchange on cash and cash equivalents (3,734) 1,919 (3,028)
Balance, beginning of period 75,768 151,803 253,307
Balance, end of period 125,222 75,768 151,803
Supplemental cash flow information:      
Interest paid (95,050) (51,017) (58,053)
Income taxes refunded (paid), net 19,003 (7,239) 15,200
Capital assets purchased on account $ 39,163 $ 37,363 $ 29,726