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Long-Term Debt Debt Maturity Schedule (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) payment | Dec. 31, 2014 USD ($)
Debt Instrument [Line Items] |  |
Long-term debt | $ 384,316,000 | $ 384,949,000
Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Loan amortization period | 10 years |
Number of monthly principal and interest payments | payment | 120 |
Fiscal Year Amortization Schedule [Abstract] |  |
Total payment, 2016 | $ 4,034,000 |
Total payment, 2017 | 11,469,000 |
Interest, 2016 | 762,000 |
Interest, 2017 | 110,000 |
Principal, 2016 | 3,272,000 |
Principal, 2017 | $ 11,359,000 |
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 | $ 2,836,000 | 2,947,000
Stated interest rates | 5.68% |
Fiscal Year Amortization Schedule [Abstract] |  |
Total payment, 2016 | $ 276,000 |
Total payment, 2017 | 276,000 |
Total payment, 2018 | 276,000 |
Total payment, 2019 | 276,000 |
Total payment, 2020 | 276,000 |
Total payment, thereafter | 2,210,000 |
Interest, 2016 | 157,000 |
Interest, 2017 | 150,000 |
Interest, 2018 | 143,000 |
Interest, 2019 | 135,000 |
Interest, 2020 | 127,000 |
Interest, thereafter | 42,000 |
Principal, 2016 | 119,000 |
Principal, 2017 | 126,000 |
Principal, 2018 | 133,000 |
Principal, 2019 | 141,000 |
Principal, 2020 | 149,000 |
Principal, thereafter | $ 2,168,000 |
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] |  |
Debt Instrument [Line Items] |  |
Standby letters of credit | $ 3,000,000 |
Fiscal Year Amortization Schedule [Abstract] |  |
Line of Credit Facility, Renewal Term | 1 year |
San Jose Water Company [Member] | Bonds [Member] | California Pollution Control Financing Authority Revenue Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 50,000,000 | 50,000,000
Stated interest rates | 5.10% |
San Jose Water Company [Member] | SDWSRF loans [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,849,000 | $ 1,997,000
Fiscal Year Amortization Schedule [Abstract] |  |
Total payment, 2016 | 132,000 |
Total payment, 2017 | 196,000 |
Total payment, 2018 | 196,000 |
Total payment, 2019 | 196,000 |
Total payment, 2020 | 196,000 |
Total payment, thereafter | 1,200,000 |
Interest, 2016 | 31,000 |
Interest, 2017 | 42,000 |
Interest, 2018 | 38,000 |
Interest, 2019 | 34,000 |
Interest, 2020 | 30,000 |
Interest, thereafter | 92,000 |
Principal, 2016 | 101,000 |
Principal, 2017 | 154,000 |
Principal, 2018 | 158,000 |
Principal, 2019 | 162,000 |
Principal, 2020 | 166,000 |
Principal, thereafter | $ 1,108,000 |
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% | 2.60%

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