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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 2) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Fair value amounts included in the carrying value of        
Cash and cash equivalents $ 408,323 $ 211,349 $ 287,019 $ 222,514
Short-term investments 588,041 402,247    
Investments 28,419 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 366,680 199,402    
Total 366,680 199,402    
Level 2
        
Fair value amounts included in the carrying value of        
Cash and cash equivalents 41,643 11,947    
Short-term investments 583,199 395,855    
Accounts receivable, net 159      
Investments 28,419      
Accrued liabilities (127)      
Total 653,293 407,802    
Level 3
        
Fair value amounts included in the carrying value of        
Short-term investments 4,842 6,392    
Investments   9,792    
Prepaid expenses and other current assets 320 486    
Other assets   606    
Total 5,162 17,276    
Total fair value
        
Fair value amounts included in the carrying value of        
Cash and cash equivalents 408,323 211,349    
Short-term investments 588,041 402,247    
Accounts receivable, net 159      
Investments 28,419 9,792    
Prepaid expenses and other current assets 320 486    
Other assets   606    
Accrued liabilities (127)      
Total $ 1,025,135 $ 624,480