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Fair Value of Financial Instruments and Concentration of Credit Risk (Tables)
 3 Months Ended
Mar. 31, 2013
Fair Value Disclosures [Abstract]  
Estimated fair values of senior credit facility loans
The estimated fair values of the senior credit facility loans at March 31, 2013 and December 31, 2012 are presented below. 
Fair Value of Debt
March 31, 2013
 
December 31, 2012

(Amounts in thousands)
Carrying
Amount
 
Fair Value
 
Carrying
Amount
 
Fair Value
Senior credit facility debt
$
493,500

 
$
488,565

 
$
516,250

 
$
513,669
Schedule of amounts recognized in cost of sales in Consolidated Statements of Income
Amounts recognized in cost of sales in the Consolidated Statements of Income at the maturity of the related foreign currency derivative financial instruments were as follows: 
Gain (Loss) on Currency Derivatives
Three Months Ended March 31,
(Amounts in thousands)
2013
 
2012
Loss on foreign currency derivative financial instruments
$
(43
)
 
$
(4
)
Summary of derivatives held by the company
Derivatives held by the Company are summarized as follows: 
Derivative Financial Instruments
Carrying
Value on
Consolidated Balance
 
Assets (Liabilities) Measured at Fair Value
(Amounts in thousands)
Sheets
 
Level 1
 
Level 2
 
Level 3
March 31, 2013:
 
 
 
 
 
 
 
Interest rate hedge agreements
$
(3,988
)
 
—

 
$
(3,988
)
 
—

Foreign currency hedge agreements
(393
)
 
—

 
(393
)
 
—

 
 
 
 
 
 
 
 
December 31, 2012:
 
 
 
 
 
 
 
Interest rate hedge agreements
$
(3,960
)
 
—

 
$
(3,960
)
 
—

Foreign currency hedge agreements
(28
)
 
—

 
(28
)
 
—