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Income Taxes: Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred Tax Assets, Net [Abstract] |  |
Regulatory liabilities | $ 77,099 | $ 90,535
State tax credits | 23,342 | 23,339
Federal NOL (a) | 227,535 | 96,155
State NOL (a) | 33,639 | 9,914
Partnership | 13,395 | 15,601
Credit Carryovers | 68,646 | 51,445
Other deferred tax assets | 31,996 | 40,143
Less: Valuation allowance | (14,719) | (13,943)
Total deferred tax assets | 460,933 | 313,189
Deferred tax liabilities: |  |
Accelerated depreciation, amortization and other plant-related differences | (597,284) | (551,137)
Regulatory assets (a) | (124,582) | (28,007)
Goodwill | (45,471) | (30,590)
State deferred tax liability (a) | (109,136) | (73,910)
Other deferred tax liabilities | (49,848) | (38,169)
Total deferred tax liabilities | (926,321) | (721,813)
Net deferred tax liability | $ (465,388) | $ (408,624)

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