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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2013
Commitments and Contingencies Disclosure [Abstract]  
Summary Of Purchase And Sale Commitments
 
Volume
(Barrels)
 
Value
Fixed price purchases
16

 
$
1,432

Fixed price sales
91

 
$
8,792

Floating price purchases
20,067

 
$
1,941,213

Floating price sales
20,938

 
$
2,026,195