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RISK MANAGEMENT AND DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Electric    
Gain / (Loss) on derivatives    
Unrealized net losses applicable to financial instruments which will settle in next twelve months $ 4,200  
Period within which financial instruments will settle 12 months  
Amount of Gain/(Loss) Recognized on Balance Sheet $ (1,883) $ 6,178
Amount of Gain / (Loss) Recognized in Income on Derivative (647) 9,447
Mark-to-market pre-tax gains/(losses) from ineffective portions 0 0
Gas    
Gain / (Loss) on derivatives    
Amount of Gain/(Loss) Recognized on Balance Sheet (447) (511)
Commodity contracts | Electric    
Gain / (Loss) on derivatives    
Amount of Gain/(Loss) Recognized on Balance Sheet (6,853) (6,780)
Amount of Gain / (Loss) Recognized in Income on Derivative (8,115) (1,659)
Commodity contracts | Gas    
Gain / (Loss) on derivatives    
Amount of Gain/(Loss) Recognized on Balance Sheet (447) (511)
Transmission congestion rights (TCR) | Electric    
Gain / (Loss) on derivatives    
Amount of Gain/(Loss) Recognized on Balance Sheet 4,970 12,958
Amount of Gain / (Loss) Recognized in Income on Derivative $ 7,468 $ 11,106