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CONCENTRATION OF RISK Derivative Counterparties (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Concentration Risk [Line Items]  
Fair Value of Derivative Assets $ 58,925
JPMorgan Chase Bank [Member]
 
Concentration Risk [Line Items]  
Fair Value of Derivative Assets 41,323 [1]
Wells Fargo Bank [Member]
 
Concentration Risk [Line Items]  
Fair Value of Derivative Assets 4,782 [1]
Bank of Nova Scotia [Member]
 
Concentration Risk [Line Items]  
Fair Value of Derivative Assets 4,315 [1]
Other Lenders in Our Credit Facility [Member]
 
Concentration Risk [Line Items]  
Fair Value of Derivative Assets 8,146
Various [Member]
 
Concentration Risk [Line Items]  
Fair Value of Derivative Assets $ 359 [2]
[1] Major lender in our revolving credit facility. See Note 8, Long-Term Debt.
[2] Represents a total of 28 counterparties.