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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Advances and contributions $ 22,573 $ 19,547
Unamortized investment tax credit 619 649
Pensions, postretirement benefits and stock-based compensation 41,180 32,450
Debt premium, net 6,290 7,002
California franchise tax 756 456
Net operating loss 550 1,046
Other 6,792 7,211
Gross deferred tax assets 78,760 68,361
Valuation allowance 0 (1,924)
Total deferred tax assets 78,760 66,437
Deferred tax liabilities:    
Utility plant 209,541 211,079
Pension and postretirement 31,227 22,263
Deferred gain and other-property 5,875 5,872
Regulatory asset - business combinations debt premium, net 6,290 7,002
Intangibles 3,443 3,693
Deferred revenue 297 1,962
Regulatory asset - income tax temporary differences, net 1,195 295
Section 481(a) adjustments 4,763 5,721
Other 7,544 4,148
Total deferred tax liabilities 270,175 262,035
Net deferred tax liabilities $ 191,415 $ 195,598