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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2013
Text Block [Abstract]  
Schedule of assets and liabilities measured at fair value on a recurring basis
Assets and liabilities measured at fair value on a recurring basis are summarized below (in thousands):
 
Fair Value Measurements as of March 31, 2013
 
Total
 
Level 1
 
Level 2
 
Level 3
Non-qualified deferred compensation assets
$
21,603

 
$
21,603

 
—

 
—

Total assets at fair value
$
21,603

 
$
21,603

 
—

 
—

Foreign exchange contracts, net
$
(841
)
 
—

 
$
(841
)
 
—

Commodity contracts, net
(955
)
 
—

 
(955
)
 
—

Non-qualified deferred compensation liabilities
(21,603
)
 
$
(21,603
)
 
—

 
—

Total liabilities at fair value
$
(23,399
)
 
$
(21,603
)
 
$
(1,796
)
 
—

 
Fair Value Measurements as of December 31, 2012
 
Total
 
Level 1
 
Level 2
 
Level 3
Non-qualified deferred compensation assets
$
15,872

 
$
15,872

 
—

 
—

Total assets at fair value
$
15,872

 
$
15,872

 
—

 
—

Foreign exchange contracts, net
$
(2,617
)
 
—

 
$
(2,617
)
 
—

Commodity contracts, net
(124
)
 
—

 
(124
)
 
—

Non-qualified deferred compensation liabilities
(15,872
)
 
$
(15,872
)
 
—

 
—

Total liabilities at fair value
$
(18,613
)
 
$
(15,872
)
 
$
(2,741
)
 
—