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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Fair value amounts included in the carrying value of        
Cash and cash equivalents $ 312,020 $ 211,349 $ 242,533 $ 222,514
Short-term investments 438,932 402,247    
Investments 8,131 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 280,093 199,402    
Total 280,093 199,402    
Level 2
        
Fair value amounts included in the carrying value of        
Cash and cash equivalents 31,927 11,947    
Short-term investments 432,537 395,855    
Accounts receivable, net 349      
Accrued liabilities (370)      
Total 464,443 407,802    
Level 3
        
Fair value amounts included in the carrying value of        
Short-term investments 6,395 6,392    
Investments 8,131 9,792    
Prepaid expenses and other current assets 485 486    
Other assets 539 606    
Total 15,550 17,276    
Total fair value
        
Fair value amounts included in the carrying value of        
Cash and cash equivalents 312,020 211,349    
Short-term investments 438,932 402,247    
Accounts receivable, net 349      
Investments 8,131 9,792    
Prepaid expenses and other current assets 485 486    
Other assets 539 606    
Accrued liabilities (370)      
Total $ 760,086 $ 624,480