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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2011
Fair Value Measurements  
Schedule of assets and liabilities measured at fair value on a recurring basis

 

 

 

Total

 

Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)

 

Significant
Other
Observable
Inputs
(Level 2)

 

Significant
Unobservable
Inputs
(Level 3)

 

June 30, 2011

 

 

 

 

 

 

 

 

 

Commodity futures — financial assets

 

$

3,343

 

$

 

$

3,343

 

$

 

Commodity futures — financial liabilities

 

3,653

 

 

3,653

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 2010

 

 

 

 

 

 

 

 

 

Commodity futures — financial assets

 

7,052

 

 

7,052

 

 

Commodity futures — financial liabilities

 

12,040

 

 

12,040