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Income Taxes Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Advances and contributions $ 14,592 $ 12,036
Unamortized investment tax credit 418 441
Pensions and postretirement benefits 20,439 21,807
California franchise tax 981 1,278
Merger related expenses 4,527 0
Tax related net regulatory liability 16,212 17,166
Other 3,336 3,440
Total deferred tax assets 60,505 56,168
Deferred tax liabilities:    
Utility plant 114,731 114,695
Pension and postretirement benefits 18,534 19,184
Investment in California Water Service Group stock 0 1,199
Deferred gain and other-property related 5,753 5,640
Debt reacquisition costs 170 204
Other 968 1,041
Total deferred tax liabilities (140,156) (141,963)
Net deferred tax liabilities $ 79,651 $ 85,795