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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Fair value of certain financial assets and liabilities        
Cash and cash equivalents $ 921,326 $ 797,957 $ 888,247 $ 637,513
Short-term investments 250,753 533,063    
Investments 2,077 12,905    
Asset transfers between Level 1 and Level 2 measurements 0 0    
Total fair value        
Fair value of certain financial assets and liabilities        
Cash 556,197 518,178    
Foreign currency derivatives 55      
Assets measured at fair value 1,174,211 1,343,238    
Cash and cash equivalents 921,326 797,957    
Short-term investments 250,753 533,063    
Accounts receivable, net 197 329    
Investments 2,077 12,905    
Accrued liabilities (142) (1,016)    
Foreign currency derivatives   (687)    
Total fair value | Money market funds        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 314,405 191,131    
Total fair value | Certificates of deposit        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 6,859 28,049    
Total fair value | Commercial paper        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 66,288 96,867    
Total fair value | Variable rate demand notes        
Fair value of certain financial assets and liabilities        
Assets measured at fair value   21,680    
Total fair value | Municipal securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value   167,224    
Total fair value | U.S. government agency securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 47,982 73,634    
Total fair value | U.S. treasuries        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 182,425 247,162    
Level 1        
Fair value of certain financial assets and liabilities        
Cash 556,197 518,178    
Assets measured at fair value 870,602 709,309    
Cash and cash equivalents 870,602 709,309    
Level 1 | Money market funds        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 314,405 191,131    
Level 2        
Fair value of certain financial assets and liabilities        
Foreign currency derivatives 55      
Assets measured at fair value 303,609 633,929    
Cash and cash equivalents 50,724 88,648    
Short-term investments 250,753 533,063    
Accounts receivable, net 197 329    
Investments 2,077 12,905    
Accrued liabilities (142) (1,016)    
Foreign currency derivatives   (687)    
Level 2 | Certificates of deposit        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 6,859 28,049    
Level 2 | Commercial paper        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 66,288 96,867    
Level 2 | Variable rate demand notes        
Fair value of certain financial assets and liabilities        
Assets measured at fair value   21,680    
Level 2 | Municipal securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value   167,224    
Level 2 | U.S. government agency securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 47,982 73,634    
Level 2 | U.S. treasuries        
Fair value of certain financial assets and liabilities        
Assets measured at fair value $ 182,425 $ 247,162