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Long-Term Debt Debt Maturity Schedule (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Long-term debt | $ 435,000 | $ 435,000
444 West Santa Clara Street, L.P. [Member] |  |
Debt Instrument [Line Items] |  |
Limited partership interest percentage | 70.00% |
San Jose Water Company [Member] | Public Utility, Bonds [Member] | California Pollution Control Financing Authority Revenue Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 120,000 |

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