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Long-Term Debt Debt Maturity Schedule (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) payment | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |
Long-term debt | $ 437,717 | $ 384,316
Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Loan amortization period | 10 years |
Number of monthly principal and interest payments | payment | 120 |
Mortgages [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rates | 5.61% |
Mortgages [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rates | 6.09% |
Mortgages [Member] | 444 West Santa Clara Street, L.P. [Member] |  |
Debt Instrument [Line Items] |  |
Loan amortization period | 20 years |
Long-term debt | $ 2,717 | 2,836
Stated interest rates | 5.68% |
Fiscal Year Amortization Schedule [Abstract] |  |
Total payment, 2016 | $ 276 |
Total payment, 2017 | 276 |
Total payment, 2018 | 276 |
Total payment, 2019 | 276 |
Total payment, 2020 | 2,208 |
Interest, 2016 | 150 |
Interest, 2017 | 143 |
Interest, 2018 | 135 |
Interest, 2019 | 127 |
Interest, 2020 | 40 |
Principal, 2016 | 126 |
Principal, 2017 | 133 |
Principal, 2018 | 141 |
Principal, 2019 | 149 |
Principal, 2020 | $ 2,168 |
444 West Santa Clara Street, L.P. [Member] |  |
Debt Instrument [Line Items] |  |
Limited partership interest percentage | 70.00% |
San Jose Water Company [Member] | Standby Letters of Credit [Member] |  |
Fiscal Year Amortization Schedule [Abstract] |  |
Line of Credit Facility, Renewal Term | 1 year |
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 |
San Jose Water Company [Member] | SDWSRF loans [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 0 | $ 1,849
San Jose Water Company [Member] | SDWSRF loans [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rates | 2.39% |
San Jose Water Company [Member] | SDWSRF loans [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rates | 2.60% |

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