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Rate and Regulatory Matters (Details Textual) (USD $)
In Millions, unless otherwise specified
1 Months Ended 9 Months Ended
Apr. 30, 2012
Sep. 30, 2012
Minimum [Member]
Sep. 30, 2012
Maximum [Member]
Settlement Agreement [Line Items]      
Percentage Of Capacity Representing Non Opposing Customers 99.50%    
Annual Cost Of Service $ 466.5    
General System Firm Transportation Rate Per Unit 0.44    
General System Firm Transportation Rate Increase 7.40%    
Duration Of Effective Period Of Rate Case Settlement   3 years 5 years