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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)