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FAIR VALUE MEASUREMENTS - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Fair Values of Assets and Liabilities Measured on a Recurring Basis [Abstract]    
Investments carried at fair value $ 21,992 $ 0
Recurring [Member]    
Fair Values of Assets and Liabilities Measured on a Recurring Basis [Abstract]    
Cash equivalents 575,601 74,272
Held to maturity investments 787,608 100,357
Available-for-sale investments 213,476 27,045
Equity securities 55,533 76,000
Investments carried at fair value 21,992  
Other assets 16,221 19,024
Derivative assets [1] 67  
Derivative liabilities [2] (1,204)  
Share appreciation rights (18,038) (11,640)
Total liabilities, net, at fair value 1,651,256 285,058
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Values of Assets and Liabilities Measured on a Recurring Basis [Abstract]    
Cash equivalents 575,601 74,272
Held to maturity investments 787,122 100,071
Available-for-sale investments 49,017 5,688
Equity securities 55,533 76,000
Investments carried at fair value 0  
Other assets 0 0
Derivative assets [1] 0  
Derivative liabilities [2] 0  
Share appreciation rights (18,038) (11,640)
Total liabilities, net, at fair value 1,449,235 244,391
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Values of Assets and Liabilities Measured on a Recurring Basis [Abstract]    
Cash equivalents 0 0
Held to maturity investments 0 0
Available-for-sale investments 0 0
Equity securities 0 0
Investments carried at fair value 0  
Other assets 0 0
Derivative assets [1] 67  
Derivative liabilities [2] (1,204)  
Share appreciation rights 0 0
Total liabilities, net, at fair value (1,137) 0
Recurring [Member] | Unobservable Inputs (Level 3) [Member]    
Fair Values of Assets and Liabilities Measured on a Recurring Basis [Abstract]    
Cash equivalents 0 0
Held to maturity investments 486 286
Available-for-sale investments 164,459 21,357
Equity securities 0 0
Investments carried at fair value 21,992  
Other assets 16,221 19,024
Derivative assets [1] 0  
Derivative liabilities [2] 0  
Share appreciation rights 0 0
Total liabilities, net, at fair value $ 203,158 $ 40,667
[1] Included in prepaid expenses and other assets in the consolidated balance sheets and not designated as hedges.
[2] Included in accrued expenses and other payables in the consolidated balance sheets and not designated as hedges.