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Income Taxes: Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred Tax Assets, Net [Abstract] |  |
Regulatory liabilities | $ 74,728 | $ 77,099
State tax credits | 22,817 | 23,342
Federal NOL | 191,992 | 227,535
State NOL | 23,031 | 33,639
Partnership | 12,755 | 13,395
Credit Carryovers | 90,881 | 68,646
Other deferred tax assets | 45,407 | 31,996
Less: Valuation allowance | (15,476) | (14,719)
Total deferred tax assets | 446,135 | 460,933
Deferred tax liabilities: |  |
Accelerated depreciation, amortization and other plant-related differences | (645,762) | (597,284)
Regulatory assets | (94,433) | (124,582)
Goodwill | (57,884) | (45,471)
State deferred tax liability | (98,200) | (109,136)
Other deferred tax liabilities | (58,797) | (49,848)
Total deferred tax liabilities | (955,076) | (926,321)
Net deferred tax liability | $ (508,941) | $ (465,388)

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