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Acquisitions (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Customer
Dec. 31, 2015
USD ($)
Customer
Dec. 31, 2014
USD ($)
Customer
Acquisitions [Abstract]      
Purchase price $ 50 $ 352 $ 369
Acquisition adjustment (3,667) (3,724)  
Wastewater Facilities of East Prospect Borough Authority [Member]      
Acquisitions [Abstract]      
Number of customers acquired | Customer     400
Purchase price     $ 281
Change in acquisition adjustment   2  
Acquisition adjustment   (665) $ (667)
Water Assets of Forest Lakes Water Association [Member]      
Acquisitions [Abstract]      
Number of customers acquired | Customer     70
Purchase price     $ 18
Change in acquisition adjustment   2  
Acquisition adjustment   (7) $ (9)
Water Assets of Lincoln Estates Mobile Home Park [Member]      
Acquisitions [Abstract]      
Number of customers acquired | Customer     200
Purchase price     $ 70
Acquisition adjustment   $ (77)  
Water Assets of The Meadows Community [Member]      
Acquisitions [Abstract]      
Number of customers acquired | Customer   90  
Purchase price   $ 63  
Acquisition adjustment   $ (159)  
Water Assets of Paradise Homes Community [Member]      
Acquisitions [Abstract]      
Number of customers acquired | Customer   90  
Purchase price   $ 36  
Acquisition adjustment   $ (28)  
Water Assets of Newberry Farms Mobile Home Park [Member]      
Acquisitions [Abstract]      
Number of customers acquired | Customer   160  
Purchase price   $ 129  
Change in purchase price 13    
Water Assets of Margaretta Mobile Home Park [Member]      
Acquisitions [Abstract]      
Number of customers acquired | Customer   65  
Purchase price   $ 102  
Change in purchase price (31)    
Acquisition adjustment $ 56    
Water Assets of Crestview Mobile Home Park [Member]      
Acquisitions [Abstract]      
Number of customers acquired | Customer 120    
Purchase price $ 47    
Acquisition adjustment $ 19    
Water Assets of Westwood Mobile Home Park [Member]      
Acquisitions [Abstract]      
Number of customers acquired | Customer 200    
Purchase price $ 21    
Acquisition adjustment $ (76)