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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair value of certain financial assets and liabilities        
Cash and cash equivalents $ 797,957 $ 637,513 $ 528,622 $ 377,582
Short-term investments 533,063 320,650    
Investments 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 518,178 393,936    
Foreign currency derivatives 687      
Assets measured at fair value 1,343,238 957,671    
Cash and cash equivalents 797,957 637,513    
Short-term investments 533,063 320,650    
Accounts receivable, net 329 43    
Investments 12,905      
Accrued liabilities (1,016) (535)    
Foreign currency derivatives   (492)    
Total fair value | Money market funds        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 191,131 191,358    
Total fair value | Certificates of deposit        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 28,049 14,075    
Total fair value | Commercial paper        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 96,867 60,422    
Total fair value | Variable rate demand notes        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 21,680 4,005    
Total fair value | Municipal securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 167,224 177,118    
Total fair value | U.S. government agency securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 73,634 39,092    
Total fair value | U.S. treasuries        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 247,162 78,157    
Level 1        
Fair value of certain financial assets and liabilities        
Cash 518,178 393,936    
Assets measured at fair value 709,309 585,294    
Cash and cash equivalents 709,309 585,294    
Level 1 | Money market funds        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 191,131 191,358    
Level 2        
Fair value of certain financial assets and liabilities        
Foreign currency derivatives 687      
Assets measured at fair value 633,929 372,377    
Cash and cash equivalents 88,648 52,219    
Short-term investments 533,063 320,650    
Accounts receivable, net 329 43    
Investments 12,905      
Accrued liabilities (1,016) (535)    
Foreign currency derivatives   (492)    
Level 2 | Certificates of deposit        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 28,049 14,075    
Level 2 | Commercial paper        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 96,867 60,422    
Level 2 | Variable rate demand notes        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 21,680 4,005    
Level 2 | Municipal securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 167,224 177,118    
Level 2 | U.S. government agency securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 73,634 39,092    
Level 2 | U.S. treasuries        
Fair value of certain financial assets and liabilities        
Assets measured at fair value $ 247,162 $ 78,157