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FAIR VALUE MEASUREMENTS (Details 4) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Liabilities    
Derivatives $ 143 $ 367
Recurring basis | Level 1
   
Assets    
Total 4,247 8,079
Recurring basis | Level 1 | Money market funds
   
Assets    
Total 4,247 8,079
Recurring basis | Level 2
   
Assets    
Total 145,920 54,440
Recurring basis | Level 2 | Government-sponsored enterprise securities
   
Assets    
Total 6,328 7,369
Recurring basis | Level 2 | Commercial paper
   
Assets    
Total 9,498 5,499
Recurring basis | Level 2 | Corporate notes
   
Assets    
Total 130,094 41,572
Recurring basis | Level 3
   
Liabilities    
Derivatives 143 367
Recurring basis | Total
   
Assets    
Total 150,167 62,519
Liabilities    
Derivatives 143 367
Recurring basis | Total | Money market funds
   
Assets    
Total 4,247 8,079
Recurring basis | Total | Government-sponsored enterprise securities
   
Assets    
Total 6,328 7,369
Recurring basis | Total | Commercial paper
   
Assets    
Total 9,498 5,499
Recurring basis | Total | Corporate notes
   
Assets    
Total $ 130,094 $ 41,572