Rate Matters (Details) (PPUC [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Rate Request Filed on March 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 March 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	$ 283
DSIC [Member] | Maximum [Member]
Rate Matters [Abstract]
Distribution system improvement charge percentage over base rate (in hundredths)	5.00%
DSIC [Member] | Minimum [Member]
Rate Matters [Abstract]
Distribution system improvement charge percentage over base rate (in hundredths)	0.00%