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Income Taxes - Schedule of Net Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Deferred tax assets:    
Deferred compensation/compensation related $ 20,750 $ 23,751
Asset retirement obligations 20,506 15,420
Operating lease liabilities 13,317 12,725
Accrued pension costs 9,958 9,528
Capitalized inventory overheads 9,951 8,359
Net operating loss 3,318 5,528
Section 174 costs 0 4,051
Other 7,053 4,645
Total deferred tax assets 84,853 84,007
Deferred tax liabilities:    
Basis differences on property, plant and equipment 317,809 209,488
Intangible assets 17,347 13,574
Operating lease right-of-use-assets 13,317 12,725
Other 21,269 17,419
Total deferred tax liabilities 369,742 253,206
Valuation allowance 3,028 5,528
Net deferred income tax liability $ (287,917) $ (174,727)