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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2024
Income Tax Disclosure [Abstract]  
Schedule of Income from Continuing Operations before Income Tax
Loss from continuing operations before income tax consisted of the following:
Year Ended December 31,
 202420232022
United States$(8,590)$(65,413)$(53,012)
Foreign(40,610)(67,061)29,190 
Loss from continuing operations before income tax
$(49,200)$(132,474)$(23,822)
Schedule of Provision for Income Taxes
Income Tax (Expense) Benefit from Continuing Operations
Income tax (expense) benefit from continuing operations consisted of the following:
Year Ended December 31,
 202420232022
Current tax (expense) benefit:
Federal$981 $1,623 $2,815 
Foreign(1,468)3,119 (7,511)
State and other(191)(144)(154)
Total current(678)4,598 (4,850)
Deferred tax (expense) benefit:
Federal6,011 15,542 6,635 
Foreign3,086 12,028 (2,842)
State and other509 143 155 
Total deferred9,606 27,713 3,948 
Income tax (expense) benefit$8,928 $32,311 $(902)
Schedule of Effective Income Tax Rate Reconciliation
The following table reconciles the effective income tax rate on continuing operations to the U.S. federal statutory rate:
Year Ended December 31,
 202420232022
U.S. federal statutory income tax rate21.0 %21.0 %21.0 %
Change in valuation allowance(11.5)(7.7)(38.2)
Adjustment to previously filed tax returns(0.4)2.0 11.3 
Tax credits (excluding foreign tax credit) 4.1 5.4 17.8 
Nondeductible compensation for executives and share-based awards(3.4)0.5 (10.5)
Net changes in uncertain tax positions6.3 (0.1)(5.6)
Difference in foreign statutory rates1.2 2.1 (8.2)
U.S. tax on foreign earnings (GILTI and Subpart F, net of FTC)(0.4)(0.1)(0.9)
Interest on tax payments/receipts1.1 0.6 10.1 
Other0.1 0.7 (0.6)
Effective income tax rate on continuing operations18.1 %24.4 %(3.8)%
Schedule of Temporary Differences and Resulting Deferred Tax Liability The nature of these temporary differences and the resulting net deferred tax balances follow:
December 31,
 20242023
Deferred tax assets:
Net operating losses(a)
$157,942 $116,353 
Canadian pool of SR&ED(a)
96,458 96,113 
Property, plant and equipment basis differences74,408 123,521 
Tax credit carryforwards(a)
71,013 71,741 
Environmental liabilities39,316 39,258 
Deferred U.S. interest deductions(a)
36,286 33,188 
Pension, postretirement and other employee benefits19,534 25,114 
Capitalized costs18,275 19,868 
Deferred foreign interest deductions(a)
7,601 3,290 
Other compensation7,050 5,412 
State net operating losses(a)
3,454 3,536 
Other deferred tax assets23,636 21,003 
Total gross deferred tax assets554,973 558,397 
Valuation allowance(a)
(86,082)(78,858)
Total deferred tax assets, net of valuation allowance468,891 479,539 
Deferred tax liabilities:
Property, plant and equipment basis differences(110,577)(115,315)
Prepaid expenses(4,487)(19,253)
Intangible assets(2,326)(4,377)
Other deferred tax liabilities(15,686)(10,603)
Total deferred tax liabilities(133,076)(149,548)
Net deferred tax asset$335,815 $329,991 
Net deferred tax asset as reflected in consolidated balance sheets:
Deferred tax assets$349,500 $345,181 
Deferred tax liabilities(13,685)(15,190)
$335,815 $329,991 
(a)Further detail of these items as of December 31, 2024 follows:
Gross AmountTax EffectedValuation AllowanceExpiration
Foreign R&D credit carryforwards$31,212 $31,212 $(31,212)2025-2042
U.S. tax credit carryforwards44,924 39,801 (19,270)2025-2033
State net operating losses74,124 3,454 (1,792)2025-2044
Canada non-capital losses626,536 141,987 (1,739)2027-2043
Other foreign net operating losses14,828 3,827 (1,998)2040-None
Canada pool of SR&ED417,988 96,458 — None
U.S. interest limitation carryforward164,938 36,286 (22,470)None
U.S. federal net operating losses57,750 12,128 — None
Foreign interest limitation carryforward30,479 7,601 (7,601)None
Schedule of Unrecognized Tax Benefits Roll Forward A reconciliation of beginning and ending unrecognized tax benefits balances follows:
Year Ended December 31,
 202420232022
Balance at beginning of period$13,580 $11,015 $12,073 
Decreases related to prior year tax positions(3,035)(1,612)(255)
Increases related to prior year tax positions905 2,804 440 
Decreases related to current year tax positions— — (2,386)
Increases related to current year tax positions957 1,373 1,143 
Decreases due to statutory expirations(1,963)— — 
Balance at end of period$10,444 $13,580 $11,015 
Schedule of Income Tax Examinations The following table provides the tax years that remain open to examination by significant taxing jurisdictions:
Open Tax Years
U.S.2020-2024
France2021-2024
Canada2020-2024