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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Narrative (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contractual maturity of current available-for-sale securities (less than) | 1 year |  |
Available-for-sale marketable debt securities in a continuous unrealized loss position for longer than twelve months | $ 0 |  |
Assets measured at fair value on a nonrecurring basis |  |  |
Equity securities without readily determinable fair values | 301,600,000 |  | $ 353,100,000
Total upward adjustments to equity securities without readily determinable fair value | 19,900,000 |  |
Total downward adjustments to equity securities without readily determinable fair value | 58,100,000 |  |
Contingent Consideration Arrangements |  |  |
Total maximum contingent payment | 30,000,000.0 |  |
Gross fair value, before unamortized discount | 1,300,000 |  |
Non-current portion of contingent consideration | 600,000 |  | $ 6,900,000
Impairment of equity securities without readily determinable fair value | 51,500,000 |  |
Contingent Consideration Arrangements |  |  |
Contingent Consideration Arrangements |  |  |
Assumption of contingent consideration arrangement liability | 1,000,000 | $ 0 |
Settlements of contingent consideration arrangements | $ 1,000,000 | $ 1,988,000 |
Discount Rate | Contingent Consideration Arrangements |  |  |
Contingent Consideration Arrangements |  |  |
Discount rate on contingent consideration (as a percent) | 0.25 |  | 0.25

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