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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