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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 2) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Fair value amounts included in the carrying value of        
Cash and cash equivalents $ 1,696,295 $ 370,323 $ 373,051 $ 211,349
Short-term investments 1,234,858 781,134    
Investments 52,364 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 863,338 303,018    
Total 863,338 303,018    
Level 2        
Fair value amounts included in the carrying value of        
Cash and cash equivalents 832,957 67,305    
Short-term investments 1,231,612 777,224    
Accounts receivable, net   83    
Investments 52,364 42,940    
Accrued liabilities   (335)    
Total 2,116,933 887,217    
Level 3        
Fair value amounts included in the carrying value of        
Short-term investments 3,246 3,910    
Accounts receivable, net 139      
Prepaid expenses and other current assets 189 250    
Accrued liabilities (278)      
Total 3,296 4,160    
Total fair value        
Fair value amounts included in the carrying value of        
Cash and cash equivalents 1,696,295 370,323    
Short-term investments 1,234,858 781,134    
Accounts receivable, net 139 83    
Investments 52,364 42,940    
Prepaid expenses and other current assets 189 250    
Accrued liabilities (278) (335)    
Total $ 2,983,567 $ 1,194,395