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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

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