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Acquisitions (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
Customer
Unit
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Acquisitions [Abstract]      
Purchase price $ 472 $ 29  
Acquisition adjustment $ (3,263)   $ (3,667)
Water Assets of Stockham's Village Mobile Home Park [Member]      
Acquisitions [Abstract]      
Number of customers acquired | Customer 80    
Purchase price $ 24    
Acquisition adjustment $ 17    
Wastewater Facilities of West York Borough [Member]      
Acquisitions [Abstract]      
Number of customers acquired | Customer 1,700    
Number of units acquired | Unit 2,200    
Purchase price $ 448    
Acquisition adjustment $ 358