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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Advances and contributions $ 26,744 $ 25,714
Unamortized investment tax credit 1,061 517
Pensions, postretirement benefits and stock-based compensation 12,529 17,844
Debt premium, net 3,446 4,157
California franchise tax 503 713
Deferred revenue 0 841
Tax related regulatory liability 23,112 24,358
Other 6,337 7,077
Total deferred tax assets 73,732 81,221
Deferred tax liabilities:    
Utility plant 277,085 243,786
Pension and postretirement 9,068 13,247
Deferred gain and other-property 608 6,456
Regulatory asset - business combinations debt premium, net 3,446 4,157
Intangibles 2,443 2,693
Deferred revenue 1,418 0
Tax related regulatory asset 50,728 44,155
Other 4,979 5,255
Total deferred tax liabilities 349,775 319,749
Net deferred tax liabilities $ 276,043 $ 238,528