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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

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