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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)