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Long-Term Debt Long-term Debt Schedule (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt	$ 435,000	$ 435,000
Unamortized Debt Issuance Expense	3,576	3,908
Current portion	0	0
Long-term debt, less current portion	431,424	431,092
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt	315,000	315,000
San Jose Water Company [Member] | Senior Notes [Member] | Series A [Member]
Debt Instrument [Line Items]
Long-term debt	$ 20,000	20,000
Stated interest rates	8.58%
San Jose Water Company [Member] | Senior Notes [Member] | Series B [Member]
Debt Instrument [Line Items]
Long-term debt	$ 30,000	30,000
Stated interest rates	7.37%
San Jose Water Company [Member] | Senior Notes [Member] | Series C [Member]
Debt Instrument [Line Items]
Long-term debt	$ 10,000	10,000
Stated interest rates	9.45%
San Jose Water Company [Member] | Senior Notes [Member] | Series D [Member]
Debt Instrument [Line Items]
Long-term debt	$ 15,000	15,000
Stated interest rates	7.15%
San Jose Water Company [Member] | Senior Notes [Member] | Series E [Member]
Debt Instrument [Line Items]
Long-term debt	$ 15,000	15,000
Stated interest rates	6.81%
San Jose Water Company [Member] | Senior Notes [Member] | Series F [Member]
Debt Instrument [Line Items]
Long-term debt	$ 20,000	20,000
Stated interest rates	7.20%
San Jose Water Company [Member] | Senior Notes [Member] | Series G [Member]
Debt Instrument [Line Items]
Long-term debt	$ 20,000	20,000
Stated interest rates	5.93%
San Jose Water Company [Member] | Senior Notes [Member] | Series H [Member]
Debt Instrument [Line Items]
Long-term debt	$ 20,000	20,000
Stated interest rates	5.71%
San Jose Water Company [Member] | Senior Notes [Member] | Series I [Member]
Debt Instrument [Line Items]
Long-term debt	$ 20,000	20,000
Stated interest rates	5.93%
San Jose Water Company [Member] | Senior Notes [Member] | Series J [Member]
Debt Instrument [Line Items]
Long-term debt	$ 10,000	10,000
Stated interest rates	6.54%
San Jose Water Company [Member] | Senior Notes [Member] | Series K [Member]
Debt Instrument [Line Items]
Long-term debt	$ 20,000	20,000
Stated interest rates	6.75%
San Jose Water Company [Member] | Senior Notes [Member] | Series L [Member]
Debt Instrument [Line Items]
Long-term debt	$ 50,000	50,000
Stated interest rates	5.14%
San Jose Water Company [Member] | Public Utility, Bonds [Member] | California Pollution Control Financing Authority Revenue Bonds [Member]
Debt Instrument [Line Items]
Long-term debt	$ 50,000	50,000
Stated interest rates	5.10%
San Jose Water Company [Member] | Public Utility, Bonds [Member] | California Pollution Control Financing Authority Revenue Bonds Two [Member]
Debt Instrument [Line Items]
Long-term debt	$ 70,000	70,000
Stated interest rates	4.75%
SJW Group [Member] | Senior Notes [Member] | Series A [Member]
Debt Instrument [Line Items]
Long-term debt	$ 50,000	50,000
Stated interest rates	4.35%
SJWTX,Inc. dba Canyon Lake Water Supply Corporation [Member] | Senior Notes [Member] | Series A [Member]
Debt Instrument [Line Items]
Long-term debt	$ 15,000	$ 15,000
Stated interest rates	6.27%

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