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Derivatives (Narrative) (Details)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
CAD
Mar. 31, 2013
Swap [Member]
gal
Mar. 31, 2013
Swap [Member]
Prepaid Expenses And Other Assets [Member]
USD ($)
Dec. 31, 2012
Swap [Member]
Prepaid Expenses And Other Assets [Member]
USD ($)
Mar. 31, 2013
Swap [Member]
Accrued Expenses And Other Liabilities [Member]
USD ($)
Dec. 31, 2012
Swap [Member]
Accrued Expenses And Other Liabilities [Member]
USD ($)
Mar. 31, 2013
Swap [Member]
Accumulated Other Comprehensive Income [Member]
USD ($)
Dec. 31, 2012
Swap [Member]
Accumulated Other Comprehensive Income [Member]
USD ($)
Derivative [Line Items]                
Fixed price swap contract (in gallons)   8,600,000            
Amount of forward contracts sold 70              
Derivative asset (Less than $1 as of December 31, 2012)     1 1        
Derivative liability (Less than $1 as of March 31, 2013 and December 31, 2012)         1 1    
Derivative accumulated other comprehensive income (Less than $1 as of March 31, 2013 and December 31, 2012)             $ 1 $ 1