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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred Tax Assets    
Employee Benefits $ 39,216 $ 41,842
Regulatory Liabilities 57,353 75,293
Tax Credit Carryforwards, net of federal impact 20,209 27,965
Cost of Removal 37,360 26,512
Net Operating Loss Carryforward, net of federal impact 1,853 1,323
Other 12,107 11,067
Total Deferred Tax Assets 168,098 184,002
Deferred Tax Liabilities    
Differences Related to Property (334,201) (297,981)
Retirement Benefits Regulatory Asset (22,789) (40,766)
Pension Expense (24,269) (24,578)
Other (8,141) (8,945)
Total Deferred Tax Liabilities (389,400) (372,270)
Deferred Income Taxes $ (221,302) $ (188,268)