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INVESTMENTS - Summary of Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |  |
Option and other equity investments | $ 0 | $ 1,405 | $ 73,902 | $ 82,966
Investments | 37,671 | 76,576 |  |
Redeemable Preferred Stock |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Available-for-sale securities - redeemable preferred shares | $ 0 | $ 0 |  |
Redeemable Preferred Stock | Minimum |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Available for sale securities, percent ownership of voting stock | 19.00% | 19.00% |  |
Redeemable Preferred Stock | Maximum |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Available for sale securities, percent ownership of voting stock | 25.00% | 25.00% |  |
Fair Value Option Investments |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Option and other equity investments | $ 0 | $ 1,405 |  |
Fair Value Option Investments | Minimum |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, percent ownership of voting stock | 10.00% | 10.00% |  |
Fair Value Option Investments | Maximum |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, percent ownership of voting stock | 19.00% | 19.00% |  |
Other Equity Investments |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Option and other equity investments | $ 37,671 | $ 75,171 |  |
Other Equity Investments | Minimum |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, percent ownership of voting stock | 1.00% | 1.00% |  |
Other Equity Investments | Maximum |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, percent ownership of voting stock | 19.00% | 19.00% |  |

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