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FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Schedule of Investments [Line Items] |  |  |  |
Carrying value of investments in equity securities without readily determinable fair value | $ 5,100,000 | $ 5,100,000 |  | $ 5,100,000
Gross unrealized losses of downward adjustments to the carrying value of equity securities without readily determinable fair values | 6,100,000 | 6,100,000 |  |
Impairment charge on equity securities without readily determinable fair value |  | $ 0 | $ 0 |
Trade Name | United Kingdom |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Impairment of intangible assets | $ 4,600,000 |  |  |

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