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Rate Matters (Details) - DSIC [Member] - PPUC [Member] - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Rate Matters [Abstract]    
Distribution system improvement charge revenue $ 0 $ 0
Maximum [Member]    
Rate Matters [Abstract]    
Distribution system improvement charge percentage over base rate 5.00%  
Minimum [Member]    
Rate Matters [Abstract]    
Distribution system improvement charge percentage over base rate 0.00%