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Derivative and Hedging Instruments (Details-2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Offsetting Assets [Line Items]    
Collateral posted against derivative positions $ 0 $ (200)
Commodity Derivative Contracts [Member]
   
Offsetting Assets [Line Items]    
Gross amounts 1,555 1,523
Gross amounts offset in balance sheet (525) (99)
Collateral posted against derivative positions 0 (175)
Net amount presented in balance sheet 1,030 1,249
Financial Transmission Rights [Member]
   
Offsetting Assets [Line Items]    
Gross amounts 1,237 363
Gross amounts offset in balance sheet 0 0
Collateral posted against derivative positions 0 0
Net amount presented in balance sheet $ 1,237 $ 363