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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred Tax Assets    
Employee Benefits $ 39,959 $ 39,216
Regulatory Liabilities 56,479 57,353
Tax Credit Carryforwards 21,836 20,209
Cost of Removal 32,993 37,360
Asset Retirement Obligations 9,494 6,557
Net Operating Loss Carryforward 2,336 1,853
Other 11,310 5,550
Total Deferred Tax Assets 174,407 168,098
Deferred Tax Liabilities    
Differences Related to Property (347,885) (334,201)
Retirement Benefits Regulatory Asset (22,458) (22,789)
Pension Expense (24,875) (24,269)
Other (16,462) (8,141)
Total Deferred Tax Liabilities (411,680) (389,400)
Deferred Income Taxes $ (237,273) $ (221,302)