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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 2) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Fair value amounts included in the carrying value of        
Cash and cash equivalents $ 1,240,717 $ 370,323 $ 408,323 $ 211,349
Short-term investments 1,544,710 781,134    
Investments 34,355 42,940    
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 818,249 303,018    
Total 818,249 303,018    
Level 2        
Fair value amounts included in the carrying value of        
Cash and cash equivalents 422,468 67,305    
Short-term investments 1,543,223 777,224    
Accounts receivable, net 48 83    
Investments 34,355 42,940    
Accrued liabilities (618) (335)    
Total 1,999,476 887,217    
Level 3        
Fair value amounts included in the carrying value of        
Short-term investments 1,487 3,910    
Prepaid expenses and other current assets 48 250    
Total 1,535 4,160    
Total fair value        
Fair value amounts included in the carrying value of        
Cash and cash equivalents 1,240,717 370,323    
Short-term investments 1,544,710 781,134    
Accounts receivable, net 48 83    
Investments 34,355 42,940    
Prepaid expenses and other current assets 48 250    
Accrued liabilities (618) (335)    
Total $ 2,819,260 $ 1,194,395