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Summary of Significant Accounting Policies (Narrative) (Details)
$ in Thousands
12 Months Ended
Nov. 16, 2017
USD ($)
Dec. 31, 2018
mi²
people_served
Acequia Water Supply Corporation [Member]    
Public Utilities, General Disclosures [Line Items]    
Ownership percentage in Acequia Water Supply Corporation   25.00%
Minimum [Member]    
Public Utilities, General Disclosures [Line Items]    
Service area in square miles | mi²   246
Sales [Member] | Product Concentration Risk [Member]    
Public Utilities, General Disclosures [Line Items]    
Percentage of revenue derived from sales of water to business and residential customers   91.00%
San Jose Water Company [Member]    
Public Utilities, General Disclosures [Line Items]    
Number of people served | people_served   1,000,000
444 West Santa Clara Street, L.P. [Member]    
Public Utilities, General Disclosures [Line Items]    
Limited partership interest percentage   70.00%
SJWTX,Inc. dba Canyon Lake Water Supply Corporation [Member]    
Public Utilities, General Disclosures [Line Items]    
Number of people served | people_served   49,000
Texas Water Alliance Alliance [Member]    
Public Utilities, General Disclosures [Line Items]    
Proceeds from Sales of Business, Affiliate and Productive Assets $ 31,000  
Purchase and Sales Agreement, Holdback Amount 3,000  
Gain (Loss) on Disposition of Assets $ 12,501