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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 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)

 

September 30, 2012

 

 

 

 

 

 

 

 

 

Commodity options — financial liabilities

 

$

35

 

$

—

 

$

35

 

$

—

 

Commodity futures — financial assets

 

2,357

 

—

 

2,357

 

—

 

Commodity futures — financial liabilities

 

9,809

 

—

 

9,809

 

—

 

 

 

 

 

 

 

 

 

 

 

December 31, 2011

 

 

 

 

 

 

 

 

 

Investments 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

 

—