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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair value of certain financial assets and liabilities        
Cash and cash equivalents $ 1,180,413 $ 797,957 $ 637,513 $ 528,622
Short-term investments 881,354 533,063    
Investments 44,291 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 796,421 518,178    
Assets measured at fair value 2,103,480 1,343,238    
Cash and cash equivalents 1,180,413 797,957    
Short-term investments 881,354 533,063    
Accounts receivable, net 69 329    
Investments 44,291 12,905    
Accrued liabilities (2,647) (1,016)    
Foreign currency derivatives (2,578) (687)    
Total fair value | Money market funds        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 352,730 191,131    
Total fair value | Certificates of deposit        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 23,137 28,049    
Total fair value | Commercial paper        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 130,883 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 9,083 167,224    
Total fair value | U.S. government agency securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 91,882 73,634    
Total fair value | U.S. treasuries        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 701,922 247,162    
Level 1        
Fair value of certain financial assets and liabilities        
Cash 796,421 518,178    
Assets measured at fair value 1,149,151 709,309    
Cash and cash equivalents 1,149,151 709,309    
Level 1 | Money market funds        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 352,730 191,131    
Level 2        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 954,329 633,929    
Cash and cash equivalents 31,262 88,648    
Short-term investments 881,354 533,063    
Accounts receivable, net 69 329    
Investments 44,291 12,905    
Accrued liabilities (2,647) (1,016)    
Foreign currency derivatives (2,578) (687)    
Level 2 | Certificates of deposit        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 23,137 28,049    
Level 2 | Commercial paper        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 130,883 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 9,083 167,224    
Level 2 | U.S. government agency securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 91,882 73,634    
Level 2 | U.S. treasuries        
Fair value of certain financial assets and liabilities        
Assets measured at fair value $ 701,922 $ 247,162