Rate Matters (Details) - PPUC [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Rate Request Filed on May 29, 2013 [Member] | Water [Member]
Rate Matters [Abstract]
Requested dollar increase in annual revenue			$ 7,116
Authorized dollar increase in annual revenue			4,972
Rate Request Filed on May 29, 2013 [Member] | Wastewater [Member]
Rate Matters [Abstract]
Requested dollar increase in annual revenue			28
Authorized dollar increase in annual revenue			28
DSIC [Member]
Rate Matters [Abstract]
Distribution system improvement charge revenue	$ 0	$ 0	$ 0	$ 0
DSIC [Member] | Maximum [Member]
Rate Matters [Abstract]
Distribution system improvement charge percentage over base rate			5.00%
DSIC [Member] | Minimum [Member]
Rate Matters [Abstract]
Distribution system improvement charge percentage over base rate			0.00%