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DERIVATIVE INSTRUMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Interest Rate Contracts:    
Total $ 18,228 $ (7,005)
Net realized gains (losses), derivative instruments, energy-related contracts (2,800) (2,600)
Fair value derivative instruments with credit-risk-related features 33,600  
Additional collateral, aggregate fair value 31,500  
Designated as Hedging Instrument    
Interest Rate Contracts:    
Losses recognized in AOCL on effective portion 0 0
Losses reclassified from AOCL into income (86) (23)
Gains (losses) recognized in income on ineffective portion 0 0
Not Designated as Hedging Instrument    
Interest Rate Contracts:    
Gain (losses) on energy related commodity contracts 18,655 (6,707)
Gain (losses) on interest rate contracts $ (427) $ (298)