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Income Taxes Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Advances and contributions $ 19,547 $ 14,592
Unamortized investment tax credit 649 418
Pensions and postretirement benefits 32,450 20,439
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Unearned Premiums Reserve 7,002 0
California franchise tax 456 981
Deferred Tax Assets, Operating Loss Carryforwards 1,046 0
Merger related expenses 0 4,527
Tax related net regulatory liability 0 16,212
Other 7,211 3,336
Gross deferred tax assets 68,361 60,505
Deferred Tax Assets, Valuation Allowance (1,924) 0
Deferred Tax Assets, Net of Valuation Allowance 66,437 60,505
Deferred tax liabilities:    
Utility plant 211,079 114,731
Pension and postretirement benefits 22,263 18,534
Deferred gain and other-property related 5,872 5,753
Deferred Tax Liabilities, Regulatory Asset, Debt Premium 7,002 0
Deferred Tax Liabilities, Intangible Assets 3,693 0
Deferred Tax Liabilities, Tax Deferred Income 1,962 0
Deferred Tax Liability, Regulatory Asset, Income Tax Temporary Differences 295 0
Deferred Tax Liabilities, Change in Accounting Policy 5,721 0
Other 4,148 1,138
Total deferred tax liabilities (262,035) (140,156)
Net deferred tax liabilities $ 195,598 $ 79,651