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DERIVATIVE INSTRUMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Interest Rate Contracts:        
Total $ (21,600) $ 15,226 $ (3,372) $ 8,221
Net realized gains (losses), derivative instruments, energy-related contracts (1,600) (2,100) (4,400) (4,800)
Fair value derivative instruments with credit-risk-related features 22,100   22,100  
Additional collateral, aggregate fair value 20,100   20,100  
Designated as Hedging Instrument        
Interest Rate Contracts:        
Losses recognized in AOCL on effective portion 0 0 0 0
Losses reclassified from AOCL into income (82) (187) (168) (210)
Gains (losses) recognized in income on ineffective portion 0 0 0 0
Not Designated as Hedging Instrument        
Interest Rate Contracts:        
Gain (losses) on energy related commodity contracts (21,371) 14,685 (2,716) 7,978
Gain (losses) on interest rate contracts $ (229) $ 541 $ (656) $ 243