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DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 3 (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Fair Value Hedges | Commodity contracts | Cost of product sales
        
Derivative Instruments, Gain (Loss)        
Amount of gain (loss) recognized in income on derivative $ (254) $ 9,188 $ 959 $ 7,912
Amount of gain (loss) recognized in income on hedged item 315 (12,118) (1,782) (10,482)
Amount of gain (loss) recognized in income on derivative (ineffective portion) 61 (2,930) (823) (2,570)
Cash Flow Hedges | Interest rate swaps | Interest expense, net
        
Derivative Instruments, Gain (Loss)        
Amount of gain (loss) recognized in income on derivative (ineffective portion) 0 0 0 0
Amount of gain (loss) reclassified from accumulated OCI into income (effective portion) (2,671) (2,475) (5,437) (2,962)
Cash Flow Hedges | Interest rate swaps | Other comprehensive income
        
Derivative Instruments, Gain (Loss)        
Amount of gain (loss) recognized in OCI on derivative (effective portion) 0 2,526 0 7,213
Nondesignated Derivatives
        
Derivative Instruments, Gain (Loss)        
Amount of gain (loss) recognized in income on derivative   7,277   231
Nondesignated Derivatives | Commodity contracts | Cost of product sales
        
Derivative Instruments, Gain (Loss)        
Amount of gain (loss) recognized in income on derivative (4,442) 7,276 (4,410) 449
Nondesignated Derivatives | Commodity contracts | (Loss) income from discontinued operations
        
Derivative Instruments, Gain (Loss)        
Amount of gain (loss) recognized in income on derivative       (218)
Nondesignated Derivatives | Commodity contracts | Operating expenses
        
Derivative Instruments, Gain (Loss)        
Amount of gain (loss) recognized in income on derivative   $ 1