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Regulatory Rate Filings (Details)
Feb. 29, 2016
USD ($)
Feb. 05, 2016
USD ($)
$ / Ccf
Dec. 15, 2015
USD ($)
$ / Ccf
Apr. 23, 2015
USD ($)
Jan. 05, 2015
USD ($)
Regulatory Liabilities [Line Items]          
Regulatory Rate Filings, Requested Rate Increase, Year One         $ 34,928,000
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         $ 9,954,000
Regulatory Rate Filings, Proposed Rate Increase, Percent of Authorized Revenue, Year Two         3.11%
Regulatory Rate Filings, Requested Rate Increase, Year Three         $ 17,567,000
Regulatory Rate Filings, Requested Rate Increase, Percent of Authorized Revenue, Year Three         5.36%
Balancing Account, Recovery Request     $ 2,599,000   $ 4,752,000
Memorandum Account, Authorized Recovery   $ 7,668,000      
Balancing Account, Uncollected     $ 590,000    
Regulatory Rate Filings, Recommended Rate Increase, Year One       $ 23,468,000  
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       $ 13,803,000  
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       $ 16,261,000  
Regulatory Rate Filings, Recommended Rate Increase as Percentage of Total Revenue at Time of Request, Year Three       4.95%  
Requested Regulatory Surcharge, Per CCF | $ / Ccf   0.1441 0.0492    
Regulatory Rate Filings, Requested Rate Increase, Authorized Revenue $ 1,659,000        
Regulatory Rate Filings, Increase Requested, Percent of Authorized Revenue 0.55%        
Authorized Regulatory Surcharge, Per 15 CCF $ 0.46