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MAINLAND CHINA CONTRIBUTION PLAN AND PROFIT APPROPRIATION (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
MAINLAND CHINA CONTRIBUTION PLAN AND PROFIT APPROPRIATION      
Defined contribution plan expenses $ 3.7 $ 3.5 $ 2.9
Aggregate balance of statutory common reserves 58.2 $ 43.3 $ 39.4
Restrictions of statutory reserves $ 411.9