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Accounting For Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred income tax assets:    
Regulatory liabilities $ 197,998 $ 200,513
Tax credits and NOL carryforwards 74,782 64,994
Provisions for pensions 20,132 25,650
Other 54,903 38,181
Total gross deferred income tax assets 347,815 329,338
Valuation allowances for deferred tax assets (3,874) (9,626)
Total deferred income tax assets after valuation allowances 343,941 319,712
Deferred income tax liabilities:    
Utility property, plant, and equipment 712,470 688,856
Regulatory assets 281,483 264,978
Other 24,983 8,587
Total deferred income tax liabilities 1,018,936 962,421
Net long-term deferred income tax liability $ 674,995 $ 642,709