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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Fair value of certain financial assets and liabilities        
Cash and cash equivalents $ 1,074,730 $ 797,957 $ 717,617 $ 637,513
Short-term investments 599,326 533,063    
Investments 20,571 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 719,429 518,178    
Assets measured at fair value 1,693,857 1,343,238    
Cash and cash equivalents 1,074,730 797,957    
Short-term investments 599,326 533,063    
Accounts receivable, net 185 329    
Investments 20,571 12,905    
Accrued liabilities (955) (1,016)    
Foreign currency derivatives (770) (687)    
Total fair value | Money market funds        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 319,984 191,131    
Total fair value | Certificates of deposit        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 19,959 28,049    
Total fair value | Commercial paper        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 91,445 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 76,657 73,634    
Total fair value | U.S. treasuries        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 467,153 247,162    
Level 1        
Fair value of certain financial assets and liabilities        
Cash 719,429 518,178    
Assets measured at fair value 1,039,413 709,309    
Cash and cash equivalents 1,039,413 709,309    
Level 1 | Money market funds        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 319,984 191,131    
Level 2        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 654,444 633,929    
Cash and cash equivalents 35,317 88,648    
Short-term investments 599,326 533,063    
Accounts receivable, net 185 329    
Investments 20,571 12,905    
Accrued liabilities (955) (1,016)    
Foreign currency derivatives (770) (687)    
Level 2 | Certificates of deposit        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 19,959 28,049    
Level 2 | Commercial paper        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 91,445 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 76,657 73,634    
Level 2 | U.S. treasuries        
Fair value of certain financial assets and liabilities        
Assets measured at fair value $ 467,153 $ 247,162