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FINANCIAL INSTRUMENTS (Details 3) (Cash collateral, restricted, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Change in fair value of the Company's assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)    
Beginning Balance $ 158,727 $ 185,754
Total (losses) gains (realized or unrealized) included in earnings 5,469 (5,227)
Purchases 1,287 55,148
Issuances   17,722
Settlements (102,823) (94,670)
Ending Balance 62,660 158,727
(Losses) gains for the period included in earnings related to assets still held $ 5,469 $ (5,227)
Discount rate (as a percent) 3.20%  
Maximum
   
Change in fair value of the Company's assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)    
Term 46 months  
Minimum
   
Change in fair value of the Company's assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)    
Term 4 months  
Weighted average
   
Change in fair value of the Company's assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)    
Term 18 months