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Risk Management and Derivative Financial Instruments - Gain Loss on Derivatives (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Electric            
Gain / (Loss) on derivatives            
Unrealized net gains applicable to financial instruments which will settle in next twelve months $ 300   $ 300   $ 300  
Period within which financial instruments will settle     12 months      
Amount of Gain/(Loss) Recognized on Balance Sheet 10,509 $ 3,841 $ 8,923 $ 2,406 4,633 $ (5,226)
Amount of Gain / (Loss) Recognized in Income on Derivative 1,702 1,020 800 3,036 (2,883) 6,347
Gas            
Gain / (Loss) on derivatives            
Amount of Gain/(Loss) Recognized on Balance Sheet 240 203 172 186 (461) (434)
Commodity contracts | Electric            
Gain / (Loss) on derivatives            
Amount of Gain/(Loss) Recognized on Balance Sheet 5,091 321 3,383 (2,219) (1,252) (11,157)
Amount of Gain / (Loss) Recognized in Income on Derivative 155 (855) (1,543) (2,277) (7,381) (4,850)
Commodity contracts | Gas            
Gain / (Loss) on derivatives            
Amount of Gain/(Loss) Recognized on Balance Sheet 240 203 172 186 (461) (434)
Transmission congestion rights (TCR) | Electric            
Gain / (Loss) on derivatives            
Amount of Gain/(Loss) Recognized on Balance Sheet 5,418 3,520 5,540 4,625 5,885 5,931
Amount of Gain / (Loss) Recognized in Income on Derivative $ 1,547 $ 1,875 $ 2,343 $ 5,313 $ 4,498 $ 11,197