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FINANCIAL INSTRUMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Marketable securities | $ 0 | $ 123,246
Marketable equity security | 157,174 | 419
Other non-current assets | 120,069 | 134,924
Total assets | 2,478,553 | 1,818,666
Liabilities: |  |
Contingent consideration arrangement | (13,664) | (28,631)
Quoted Market Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Total assets | 975,332 | 881,234
Liabilities: |  |
Contingent consideration arrangement | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Total assets | 1,494,292 | 937,432
Liabilities: |  |
Contingent consideration arrangement | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Total assets | 8,929 | 0
Liabilities: |  |
Contingent consideration arrangement | (13,664) | (28,631)
Money market funds |  |
Assets: |  |
Cash equivalents | 818,158 | 880,815
Money market funds | Quoted Market Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash equivalents | 818,158 | 880,815
Money market funds | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash equivalents | 0 | 0
Money market funds | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash equivalents | 0 | 0
Treasury discount notes |  |
Assets: |  |
Cash equivalents | 1,349,257 | 561,733
Marketable securities |  | 112,291
Treasury discount notes | Quoted Market Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash equivalents | 0 | 0
Marketable securities |  | 0
Treasury discount notes | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash equivalents | 1,349,257 | 561,733
Marketable securities |  | 112,291
Treasury discount notes | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash equivalents | 0 | 0
Marketable securities |  | 0
Time deposits |  |
Assets: |  |
Cash equivalents | 145,035 | 90,036
Time deposits | Quoted Market Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash equivalents | 0 | 0
Time deposits | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash equivalents | 145,035 | 90,036
Time deposits | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash equivalents | 0 | 0
Commercial paper |  |
Assets: |  |
Cash equivalents |  | 162,417
Marketable securities |  | 10,955
Commercial paper | Quoted Market Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash equivalents |  | 0
Marketable securities |  | 0
Commercial paper | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash equivalents |  | 162,417
Marketable securities |  | 10,955
Commercial paper | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash equivalents |  | 0
Marketable securities |  | 0
Marketable equity security |  |
Assets: |  |
Marketable equity security | 157,174 | 419
Marketable equity security | Quoted Market Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Marketable equity security | 157,174 | 419
Marketable equity security | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Marketable equity security | 0 | 0
Marketable equity security | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Marketable equity security | 0 | $ 0
Warrant |  |
Assets: |  |
Other non-current assets | 8,929 |
Warrant | Quoted Market Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Other non-current assets | 0 |
Warrant | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Other non-current assets | 0 |
Warrant | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Other non-current assets | $ 8,929 |

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