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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 |  |

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