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Regulatory Rate Filings (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 0 Months Ended
Sep. 30, 2013
Aug. 21, 2013
Jan. 03, 2012
Oct. 27, 2010
Oct. 03, 2013
Subsequent Event [Member]
Regulatory Rate [Line Items]          
Requested rate increase, authorized revenue, year one     $ 47,394    
Requested rate increase, authorized revenue, year one percent     21.51%    
Requested rate increase, authorized revenue, year two     12,963    
Requested rate increase, authorized revenue, year two percent     4.87%    
Requested rate increase, authorized revenue, year three     34,797    
Requested rate increase, authorized revenue, year three percent     12.59%    
Requested Recovery of Under-Collected Balance Accounts     2,599    
Amount of net over-collection requested to be refunded to customers     650    
Immediate increase requested percent of authorized revenue       38.00% 23.10%
Increase requested percent of authorized revenue       71.00%  
Rate base increase   38,000      
Return on equity increase   10.88%      
Increase percent of authorized revenue approved   33.00%      
Customer refund for over rate collections 982        
Requested rate increase, authorized revenue         $ 2,400
Regulatory rate increase protest period         150 days