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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred Tax Assets |  |
Benefit Liabilities | $ 41,724 | $ 41,292
Retirement Benefits Liabilities | 40,766 | 40,650
Tax Credit Carryforward | 32,420 | 35,132
Regulatory Tax Liability | 34,527 | 33,124
Cost of Removal | 26,512 | 25,920
Differences Related to Property | 10,251 | 7,486
Net Operating Loss Carryforward | 1,323 | 1,379
Other | 6,999 | 3,423
Valuation Allowance | 0 | (800)
Total Deferred Tax Assets | 194,522 | 187,606
Deferred Tax Liabilities |  |
Differences Related to Property | (307,542) | (271,064)
Retirement Benefits Regulatory Asset | (40,766) | (40,650)
Excess Tax Over Book Pension | (24,578) | (18,696)
Other | (9,904) | (10,572)
Total Deferred Tax Liabilities | (382,790) | (340,982)
Deferred Income Taxes | $ (188,268) | $ (153,376)

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