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FAIR VALUE MEASUREMENTS (Details 4) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Liabilities    
Derivatives $ 367 $ 51
Recurring basis | Level 1
    
Assets    
Total 8,079 15,660
Recurring basis | Level 1 | Money market funds
    
Assets    
Total 8,079 15,660
Recurring basis | Level 2
    
Assets    
Total 54,440 76,607
Recurring basis | Level 2 | Government-sponsored enterprise securities
    
Assets    
Total 7,369 8,623
Recurring basis | Level 2 | Commercial paper
    
Assets    
Total 5,499 20,644
Recurring basis | Level 2 | Corporate notes
    
Assets    
Total 41,572 47,340
Recurring basis | Level 3
    
Liabilities    
Derivatives 367 51
Recurring basis | Total
    
Assets    
Total 62,519 92,267
Liabilities    
Derivatives 367 51
Recurring basis | Total | Money market funds
    
Assets    
Total 8,079 15,660
Recurring basis | Total | Government-sponsored enterprise securities
    
Assets    
Total 7,369 8,623
Recurring basis | Total | Commercial paper
    
Assets    
Total 5,499 20,644
Recurring basis | Total | Corporate notes
    
Assets    
Total $ 41,572 $ 47,340