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v3.25.0.1

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Deferred tax assets: |  |
Net operating losses | $ 157,942 | $ 116,353
Canadian pool of SR&ED | 96,458 | 96,113
Property, plant and equipment basis differences | 74,408 | 123,521
Tax credit carryforwards | 71,013 | 71,741
Environmental liabilities | 39,316 | 39,258
Pension, postretirement and other employee benefits | 19,534 | 25,114
Capitalized costs | 18,275 | 19,868
Other compensation | 7,050 | 5,412
State net operating losses | 3,454 | 3,536
Other deferred tax assets | 23,636 | 21,003
Total gross deferred tax assets | 554,973 | 558,397
Less: Valuation allowance | (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
Deferred tax assets | 349,500 | 345,181
Deferred tax liabilities | (13,685) | (15,190)
Federal |  |
Deferred tax assets: |  |
Tax credit carryforwards | 39,801 |
Deferred interest deductions | 36,286 | 33,188
Foreign |  |
Deferred tax assets: |  |
Tax credit carryforwards | 31,212 |
Deferred interest deductions | $ 7,601 | $ 3,290

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