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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2011
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The following table provides the assets and liabilities reported at fair value and measured on a recurring basis as of December 31, 2011 and 2010:
 
 
 
 
 
Fair Value Measurements Using
  
 
Total
 
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
 
Significant Other
Observable Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Description
 
 
 
 
 
 
 
 
December 31, 2011
 
 
 
 
 
 
 
 
Asset derivatives
 
$
304

 
$
—

 
$
304

 
$
—

Liability derivatives
 
(976
)
 
—

 
(976
)
 
—

Rabbi trust assets
 
1,494

 
1,494

 
—

 
—

 
 
$
822

 
$
1,494

 
$
(672
)
 
$
—

December 31, 2010
 
 
 
 
 
 
 
 
Asset derivatives
 
$
1,617

 
$
—

 
$
1,617

 
$
—

Liability derivatives
 
(667
)
 
—

 
(667
)
 
—

Rabbi trust assets
 
1,350

 
1,350

 
—

 
—

 
 
$
2,300

 
$
1,350

 
$
950

 
$
—