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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:    
Advances and contributions $ 25,462 $ 24,584
Unamortized investment tax credit 575 599
Pensions, postretirement benefits and stock-based compensation 23,161 32,396
Debt premium, net 4,868 5,579
California franchise tax 640 514
Deferred revenue 1,444 0
Other 6,627 8,128
Total deferred tax assets 62,777 71,800
Deferred tax liabilities:    
Utility plant 229,500 216,497
Pension and postretirement 17,709 24,779
Deferred gain and other-property 5,982 5,901
Regulatory asset - business combinations debt premium, net 4,868 5,579
Intangibles 2,943 3,193
Deferred revenue 0 773
Regulatory asset - income tax temporary differences, net 12,849 6,867
Section 481(a) adjustments 1,573 3,111
Other 5,508 5,551
Total deferred tax liabilities 280,932 272,251
Net deferred tax liabilities $ 218,155 $ 200,451