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Income Taxes: Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred Tax Assets, Net [Abstract]    
Regulatory liabilities $ 90,535 $ 89,754
State tax credits 23,339 23,261
Federal NOL 96,155 120,624
State NOL 9,914 13,537
Partnership 15,601 14,030
Credit Carryovers 51,445 27,139
Other deferred tax assets 40,143 33,395
Less: Valuation allowance (13,943) (12,063)
Total deferred tax assets 313,189 309,677
Deferred tax liabilities:    
Accelerated depreciation, amortization and other plant-related differences (551,137) (533,292)
Regulatory assets (28,007) (23,586)
Goodwill (30,590) (15,875)
State deferred tax liability (73,910) (72,911)
Other deferred tax liabilities (38,169) (24,732)
Total deferred tax liabilities (721,813) (670,396)
Net deferred tax liability $ (408,624) $ (360,719)