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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)

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