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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