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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Fair value of certain financial assets and liabilities        
Cash and cash equivalents $ 701,836 $ 797,957 $ 618,344 $ 637,513
Short-term investments 233,513 533,063    
Investments 13,922 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 497,556 518,178    
Foreign currency derivatives (301)      
Assets measured at fair value 948,970 1,343,238    
Cash and cash equivalents 701,836 797,957    
Short-term investments 233,513 533,063    
Accounts receivable, net 203 329    
Investments 13,922 12,905    
Accrued liabilities (504) (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 194,560 191,131    
Total fair value | Certificates of deposit        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 1,607 28,049    
Total fair value | Commercial paper        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 57,107 96,867    
Total fair value | Variable rate demand notes        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 12,628 21,680    
Total fair value | Municipal securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 106,292 167,224    
Total fair value | U.S. government agency securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 28,931 73,634    
Total fair value | U.S. treasuries        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 50,590 247,162    
Level 1        
Fair value of certain financial assets and liabilities        
Cash 497,556 518,178    
Assets measured at fair value 692,116 709,309    
Cash and cash equivalents 692,116 709,309    
Level 1 | Money market funds        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 194,560 191,131    
Level 2        
Fair value of certain financial assets and liabilities        
Foreign currency derivatives (301)      
Assets measured at fair value 256,854 633,929    
Cash and cash equivalents 9,720 88,648    
Short-term investments 233,513 533,063    
Accounts receivable, net 203 329    
Investments 13,922 12,905    
Accrued liabilities (504) (1,016)    
Foreign currency derivatives   (687)    
Level 2 | Certificates of deposit        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 1,607 28,049    
Level 2 | Commercial paper        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 57,107 96,867    
Level 2 | Variable rate demand notes        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 12,628 21,680    
Level 2 | Municipal securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 106,292 167,224    
Level 2 | U.S. government agency securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 28,931 73,634    
Level 2 | U.S. treasuries        
Fair value of certain financial assets and liabilities        
Assets measured at fair value $ 50,590 $ 247,162