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Long-Term Debt Debt Maturity Schedule (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) payment | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |
Long-term debt | $ 435,000 | $ 437,717
Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Loan amortization period | 10 years |
Number of monthly principal and interest payments | payment | 120 |
Mortgages [Member] | 444 West Santa Clara Street, L.P. [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 0 | $ 2,717
Stated interest rates | 5.68% |
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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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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