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Risk Management and Derivative Financial Instruments (Details 2) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Electric        
Gain / (Loss) on derivatives        
Unrealized net losses applicable to financial instruments which will settle in next twelve months $ 4,700   $ 4,700  
Period within which financial instruments will settle 12 months      
Amount of Gain/(Loss) Recognized on Balance Sheet $ (1,587) $ (1,435) (2,035) $ 2,357
Amount of Gain / (Loss) Recognized in Income on Derivative (902) 2,017 (3,566) 9,909
Gas        
Gain / (Loss) on derivatives        
Amount of Gain/(Loss) Recognized on Balance Sheet (67) (17) (497) (478)
Commodity contracts | Electric        
Gain / (Loss) on derivatives        
Amount of Gain/(Loss) Recognized on Balance Sheet (1,709) (2,540) (6,022) (11,077)
Amount of Gain / (Loss) Recognized in Income on Derivative (1,698) (1,421) (8,392) (3,834)
Commodity contracts | Gas        
Gain / (Loss) on derivatives        
Amount of Gain/(Loss) Recognized on Balance Sheet (67) (17) (497) (478)
Transmission congestion rights (TCR) | Electric        
Gain / (Loss) on derivatives        
Amount of Gain/(Loss) Recognized on Balance Sheet 122 1,105 3,987 13,434
Amount of Gain / (Loss) Recognized in Income on Derivative $ 796 $ 3,438 $ 4,826 $ 13,743