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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 2) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Fair value amounts included in the carrying value of        
Cash and cash equivalents $ 373,051 $ 211,349 $ 283,839 $ 222,514
Short-term investments 453,969 402,247    
Investments 51,682 9,792    
Asset transfers between Level 1 and Level 2 measurements 0 0    
Level 1
        
Fair value amounts included in the carrying value of        
Cash and cash equivalents 352,399 199,402    
Total 352,399 199,402    
Level 2
        
Fair value amounts included in the carrying value of        
Cash and cash equivalents 20,652 11,947    
Short-term investments 447,600 395,855    
Accounts receivable, net 185      
Investments 45,232      
Accrued liabilities (147)      
Total 513,522 407,802    
Level 3
        
Fair value amounts included in the carrying value of        
Short-term investments 6,369 6,392    
Investments 6,450 9,792    
Prepaid expenses and other current assets 515 486    
Other assets 479 606    
Total 13,813 17,276    
Total fair value
        
Fair value amounts included in the carrying value of        
Cash and cash equivalents 373,051 211,349    
Short-term investments 453,969 402,247    
Accounts receivable, net 185      
Investments 51,682 9,792    
Prepaid expenses and other current assets 515 486    
Other assets 479 606    
Accrued liabilities (147)      
Total $ 879,734 $ 624,480