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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,
			2024						2023						2022
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,
			2024						2023						2022
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:
Federal			6,011						15,542						6,635
Foreign			3,086						12,028						(2,842)
State and other			509						143						155
Total deferred			9,606						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,
			2024						2023						2022
U.S. federal statutory income tax rate			21.0		%				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 positions			6.3						(0.1)						(5.6)
Difference in foreign statutory rates			1.2						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/receipts			1.1						0.6						10.1
Other			0.1						0.7						(0.6)
Effective income tax rate on continuing operations			18.1		%				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,
			2024						2023
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 differences			74,408						123,521
Tax credit carryforwards(a)			71,013						71,741
Environmental liabilities			39,316						39,258
Deferred U.S. interest deductions(a)			36,286						33,188
Pension, postretirement and other employee benefits			19,534						25,114
Capitalized costs			18,275						19,868
Deferred foreign interest deductions(a)			7,601						3,290
Other compensation			7,050						5,412
State net operating losses(a)			3,454						3,536
Other deferred tax assets			23,636						21,003
Total gross deferred tax assets			554,973						558,397
Valuation allowance(a)			(86,082)						(78,858)
Total deferred tax assets, net of valuation allowance			468,891						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 Amount						Tax Effected						Valuation Allowance						Expiration
Foreign R&D credit carryforwards			$	31,212					$	31,212					$	(31,212)					2025-2042
U.S. tax credit carryforwards			44,924						39,801						(19,270)						2025-2033
State net operating losses			74,124						3,454						(1,792)						2025-2044
Canada non-capital losses			626,536						141,987						(1,739)						2027-2043
Other foreign net operating losses			14,828						3,827						(1,998)						2040-None
Canada pool of SR&ED			417,988						96,458						—						None
U.S. interest limitation carryforward			164,938						36,286						(22,470)						None
U.S. federal net operating losses			57,750						12,128						—						None
Foreign interest limitation carryforward			30,479						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,
			2024						2023						2022
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 positions			905						2,804						440
Decreases related to current year tax positions			—						—						(2,386)
Increases related to current year tax positions			957						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
France			2021-2024
Canada			2020-2024

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