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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2012
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)

 

March 31, 2012

 

 

 

 

 

 

 

 

 

 

 

 

 

Investment in short-term commercial paper

 

$

64,982

 

$

 

$

64,982

 

$

 

Commodity options — financial assets

 

37

 

 

37

 

 

Commodity futures — financial assets

 

3,046

 

 

3,046

 

 

Commodity futures — financial liabilities

 

2,299

 

 

2,299

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 2011

 

 

 

 

 

 

 

 

 

Investment in short-term commercial paper

 

84,830

 

 

84,830

 

 

Commodity futures — financial assets

 

3,159

 

 

3,159

 

 

Commodity futures — financial liabilities

 

4,378

 

 

4,378