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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 1,162,424    
Current year other comprehensive (loss) income (768) $ (9,750) $ 4,498
Ending Balance 3,382,912 1,162,424  
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 5,449 15,199 10,701
Ending Balance 4,681 5,449 15,199
Unrealized Fair Value Gain (Loss) on Available-for-sale Investments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 5,400 18,269 0
Current year other comprehensive (loss) income (4,419) (12,869) 18,269
Ending Balance 981 5,400 18,269
Foreign Currency Translation [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 49 (3,070) 10,701
Current year other comprehensive (loss) income 3,651 3,119 (13,771)
Ending Balance $ 3,700 $ 49 $ (3,070)