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Rate and Regulatory Matters (Details) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended
Apr. 30, 2016
Nov. 30, 2015
Oct. 31, 2015
Sep. 30, 2016
Pennsylvania Public Utilities Commission [Member]        
Regulatory Liabilities [Line Items]        
Approved increase in annual operating revenues       $ 100
Originally filed increase in annual operating revenue   $ 200    
New Jersey Board of Public Utilities [Member]        
Regulatory Liabilities [Line Items]        
Originally filed increase in annual operating revenue $ 100      
Pinelands Water Company [Member]        
Regulatory Liabilities [Line Items]        
Approved increase in annual operating revenues 200      
Originally filed increase in annual operating revenue     $ 500  
Tidewater Utilities Inc [Member]        
Regulatory Liabilities [Line Items]        
Projected annual revenue       $ 300
Pinelands Wastewater [Member]        
Regulatory Liabilities [Line Items]        
Approved increase in annual operating revenues $ 100