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Concentration of Risks (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Concentration of Risks      
Minimum number of years for economic reform policies pursuing by PRC government 20 years    
Percentage of appreciation (depreciation) of US dollar against RMB 1.60% 5.00% (5.80%)