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FAIR VALUE MEASUREMENTS (Details 4) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Liabilities    
Derivatives $ 1 $ 367
Recurring basis | Level 1
    
Assets    
Total 5,445 8,079
Recurring basis | Level 1 | Money market funds
    
Assets    
Total 5,445 8,079
Recurring basis | Level 2
    
Assets    
Total 134,602 54,440
Recurring basis | Level 2 | Government-sponsored enterprise securities
    
Assets    
Total 5,657 7,369
Recurring basis | Level 2 | Commercial paper
    
Assets    
Total 12,999 5,499
Recurring basis | Level 2 | Corporate notes
    
Assets    
Total 115,946 41,572
Recurring basis | Level 3
    
Liabilities    
Derivatives 1 367
Recurring basis | Total
    
Assets    
Total 140,047 62,519
Liabilities    
Derivatives 1 367
Recurring basis | Total | Money market funds
    
Assets    
Total 5,445 8,079
Recurring basis | Total | Government-sponsored enterprise securities
    
Assets    
Total 5,657 7,369
Recurring basis | Total | Commercial paper
    
Assets    
Total 12,999 5,499
Recurring basis | Total | Corporate notes
    
Assets    
Total $ 115,946 $ 41,572