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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES - Assets - Recurring Basis (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Fair value of certain financial assets and liabilities    
Cash and cash equivalents $ 713,714 $ 528,622
Short-term investments 457,898 672,933
Investments 1,610 2,366
Asset transfers between Level 1 and Level 2 measurements 0  
Total fair value    
Fair value of certain financial assets and liabilities    
Cash 523,097 310,885
Assets measured at fair value 1,173,400 1,202,437
Foreign currency derivatives 178  
Cash and cash equivalents 713,714 528,622
Short-term investments 457,898 672,933
Accounts receivable, net 271 95
Investments 1,610 2,366
Accrued liabilities (93) (1,579)
Foreign currency derivatives   (1,484)
Total fair value | Money market funds    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 87,546 112,848
Total fair value | Certificates of deposit    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 59,104 15,720
Total fair value | Commercial paper    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 75,257 99,903
Total fair value | Variable rate demand notes    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 34,346 49,954
Total fair value | Municipal securities    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 153,204 529,984
Total fair value | U.S. government agency securities    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 128,887 81,230
Total fair value | U.S. Treasuries    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 111,781 3,397
Level 1    
Fair value of certain financial assets and liabilities    
Cash 523,097 310,885
Assets measured at fair value 610,643 423,733
Cash and cash equivalents 610,643 423,733
Level 1 | Money market funds    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 87,546 112,848
Level 2    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 562,757 778,704
Foreign currency derivatives 178  
Cash and cash equivalents 103,071 104,889
Short-term investments 457,898 672,933
Accounts receivable, net 271 95
Investments 1,610 2,366
Accrued liabilities (93) (1,579)
Foreign currency derivatives   (1,484)
Level 2 | Certificates of deposit    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 59,104 15,720
Level 2 | Commercial paper    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 75,257 99,903
Level 2 | Variable rate demand notes    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 34,346 49,954
Level 2 | Municipal securities    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 153,204 529,984
Level 2 | U.S. government agency securities    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 128,887 81,230
Level 2 | U.S. Treasuries    
Fair value of certain financial assets and liabilities    
Assets measured at fair value $ 111,781 $ 3,397