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INVESTMENTS (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Short-term Investments [Abstract] |  |  |
Debt securities, Held to maturity | $ 718,517 |  | $ 28,330
Debt securities, Available-for-sale | 168,091 |  | 21,769
Equity securities | 75,533 |  | 76,000
Short-term Investments | 962,141 |  | 126,099
Long-term Investments [Abstract] |  |  |
Debt securities, Held to maturity | 67,463 |  | 68,854
Debt securities, Available-for-sale | 45,385 |  | 5,276
Equity securities | 42,684 |  | 21,419
Equity method investments | 108,848 |  | 94,933
Investments carried at fair value | 21,992 |  | 0
Long-term Investments | 286,372 |  | $ 190,482
Marketable securities, unrealized fair value loss | $ (21,118) | $ 0 |

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