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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Advances and contributions $ 24,584 $ 22,573
Unamortized investment tax credit 599 619
Pensions, postretirement benefits and stock-based compensation 32,396 41,180
Debt premium, net 5,579 6,290
California franchise tax 514 756
Net operating loss 0 550
Other 8,128 6,792
Total deferred tax assets 71,800 78,760
Deferred tax liabilities:    
Utility plant 216,497 209,541
Pension and postretirement 24,779 31,227
Deferred gain and other-property 5,901 5,875
Regulatory asset - business combinations debt premium, net 5,579 6,290
Intangibles 3,193 3,443
Deferred revenue 773 297
Regulatory asset - income tax temporary differences, net 6,867 1,195
Section 481(a) adjustments 3,111 4,763
Other 5,551 7,544
Total deferred tax liabilities 272,251 270,175
Net deferred tax liabilities $ 200,451 $ 191,415