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Fair Value Measurement (Details) (Recurring [Member], USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Assets:    
Foreign exchange contracts $ 22  
Total assets 54,553 69,027
Liabilities:    
Foreign exchange contracts 141 225
Total liabilities 141 225
Certificates of deposits [Member]
   
Assets:    
Marketable securities 1,959 2,204
Foreign government bond [Member]
   
Assets:    
Marketable securities 581 589
Corporate bonds [Member]
   
Assets:    
Marketable securities 51,991 66,234
Level I [Member]
   
Assets:    
Foreign exchange contracts     
Total assets     
Liabilities:    
Foreign exchange contracts     
Total liabilities     
Level I [Member] | Certificates of deposits [Member]
   
Assets:    
Marketable securities     
Level I [Member] | Foreign government bond [Member]
   
Assets:    
Marketable securities     
Level I [Member] | Corporate bonds [Member]
   
Assets:    
Marketable securities     
Level II [Member]
   
Assets:    
Foreign exchange contracts 22  
Total assets 54,553 69,027
Liabilities:    
Foreign exchange contracts 141 225
Total liabilities 141 225
Level II [Member] | Certificates of deposits [Member]
   
Assets:    
Marketable securities 1,959 2,204
Level II [Member] | Foreign government bond [Member]
   
Assets:    
Marketable securities 581 589
Level II [Member] | Corporate bonds [Member]
   
Assets:    
Marketable securities 51,991 66,234
Level III [Member]
   
Assets:    
Foreign exchange contracts     
Total assets     
Liabilities:    
Foreign exchange contracts     
Total liabilities     
Level III [Member] | Certificates of deposits [Member]
   
Assets:    
Marketable securities     
Level III [Member] | Foreign government bond [Member]
   
Assets:    
Marketable securities     
Level III [Member] | Corporate bonds [Member]
   
Assets:    
Marketable securities