Regulatory Rate Filings (Details) $ in Thousands				1 Months Ended	9 Months Ended
	Jun. 28, 2016 USD ($) $ / Ccf	Jun. 10, 2016 USD ($)	Jun. 09, 2016 USD ($)	Jun. 30, 2016	Dec. 31, 2015	Jan. 05, 2015 USD ($)
Regulatory Liabilities [Line Items]
Regulatory Rate Filings, Requested Rate Increase, Year One						$ 34,928
Regulatory Rate Filings, Requested Rate Increase as Percentage of Total Revenue at Time of Request, Year One						12.22%
Regulatory Rate Filings, Requested Rate Increase, Year Two						$ 9,954
Regulatory Rate Filings, Proposed Rate Increase, Percent of Authorized Revenue, Year Two						3.11%
Regulatory Rate Filings, Requested Rate Increase, Year Three						$ 17,567
Regulatory Rate Filings, Requested Rate Increase, Percent of Authorized Revenue, Year Three						5.36%
Public Utilities, Approved Rate Increase, Percentage			8.60%
Regulatory Balancing and Memorandum Accounts, Net Under-Collected, Approved			$ 3,776
Requested Regulatory Surcharge	$ 8,767
Balancing and Memorandum Account Previously Recorded	524
Requested Regulatory Surcharge, Gross	$ 9,291
Requested Regulatory Surcharge, Per CCF | $ / Ccf	0.1832
Public Utilities, Requested Rate Increase, Amount		$ 21,439
Public Utilities, Requested Rate Increase, Percentage		6.72%
Water Reduction Target Goal, Percentage				20.00%	30.00%