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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 $ (26,387) $ (27,894) $ (78,255)
Adjustments to reconcile net loss to operating cash flows:      
Depreciation and amortization 156,287 162,622 182,022
Share-based compensation expense 12,522 16,567 16,751
Non-cash interest expense 18,072 21,199 21,303
(Benefit) provision for deferred incomes taxes (44,758) 11,514 2,549
Loss (gain) on sale or disposal of assets, net 1,106 (40,101) (6,883)
Gain on early extinguishment of debt (55,559) (4,529) (399)
Asset impairments 46,589 1,370 1,056
Pension and other postretirement benefit obligations (23,916) (13,917) (80,012)
Equity income in unconsolidated investees, net (548) (2,379) (3,421)
Change in other assets and liabilities:      
Accounts receivable, net 25,843 34,135 44,943
Inventory 4,617 18,510 (7,434)
Prepaid expenses (1,820) 16,680 3,244
Accounts payable and accrued liabilities (1,934) (65,094) (23,653)
Deferred revenue (17,277) (29,971) (30,076)
Other assets and liabilities 7,473 (4,138) (959)
Cash provided by operating activities 100,310 94,574 40,776
Investing activities      
Acquisitions, net of cash acquired 0 0 (15,432)
Purchase of property, plant, and equipment (49,534) (38,116) (45,376)
Proceeds from sale of real estate and other assets 20,976 85,298 83,504
Change in other investing activities 608 (203) (572)
Cash (used for) provided by investing activities (27,950) 46,979 22,124
Financing activities      
Payments of deferred financing costs (8,933) 0 (1,652)
Borrowings of long-term debt 837,671 0 80,000
Repayments of long-term debt (644,732) (133,821) (170,994)
Repurchase of convertible debt (248,211) 0 0
Proceeds from convertible debt 110 0 0
Acquisition of noncontrolling interests 0 0 (2,050)
Treasury stock (3,141) (2,642) (6,555)
Changes in other financing activities (1,617) 952 (1,616)
Cash used for financing activities (68,853) (135,511) (102,867)
Effect of currency exchange rate change on cash 2,062 (234) 1,152
Increase (decrease) in cash, cash equivalents and restricted cash 5,569 5,808 (38,815)
Cash, cash equivalents and restricted cash at beginning of year 110,612 104,804 143,619
Cash, cash equivalents and restricted cash at end of year $ 116,181 $ 110,612 $ 104,804