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Foreign Currency Exchange Rate Risk (Tables)
 12 Months Ended
Dec. 31, 2011
Foreign Currency [Abstract]  
Notional amounts of outstanding foreign currency forward contracts by currency
The table below presents the notional amounts of the Company’s outstanding foreign currency forward contracts by currency at December 31, 2011 and 2010 (in thousands):
 
Year Ended December 31,
 
2011
 
2010
Euro
$
19,640

 
$
41,022

Swedish kroner
18,091

 
23,212

British pound sterling
3,050

 
1,551

Australian dollar
609

 
1,017

Danish kroner
174

 
—

Japanese yen
3,581

 
—

 
$
45,145

 
$
66,802