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Regulatory Rate Filings (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
May. 29, 2015
Apr. 23, 2015
Mar. 26, 2015
Jan. 05, 2015
Regulatory Liabilities [Line Items]          
Authorized Regulatory Surcharge, Gross $ 1,937        
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%
Balancing Account, Recovery Request         $ 4,752
Memorandum Account, Recovery Request       $ 9,567 $ 976
Regulatory Rate Filings, Recommended Rate Increase, Year One     $ 23,468    
Regulatory Rate Filings, Recommended Rate Increase as Percentage of Total Revenue at Time of Request, Year One     8.54%    
Regulatory Rate Filings, Recommended Rate Increase, Year Two     $ 13,803    
Regulatory Rate Filings, Recommended Rate Increase as Percentage of Total Revenue at Time of Request, Year Two     4.42%    
Regulatory Rate Filings, Recommended Rate Increase, Year Three     $ 16,261    
Regulatory Rate Filings, Recommended Rate Increase as Percentage of Total Revenue at Time of Request, Year Three     4.95%    
Regulatory Rate Filings, Requested Rate Increase, Authorized Revenue   $ 18,357      
Regulatory Rate Filings, Increase Requested, Percent of Authorized Revenue   6.44%