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PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION (Condensed balance Sheets) (Parenthetical) (Details) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]    
Treasury Stock, Shares 12,111,537 12,175,155
Common Class A [Member]    
Condensed Financial Statements, Captions [Line Items]    
Ordinary shares, par value per share $ 0.0001 $ 0.0001
Ordinary shares, shares authorized 500,000,000 500,000,000
Ordinary shares, shares issued 96,565,584 96,565,584
Ordinary shares, shares outstanding 84,454,047 84,390,429
Common Class B [Member]    
Condensed Financial Statements, Captions [Line Items]    
Ordinary shares, par value per share $ 0.0001 $ 0.0001
Ordinary shares, shares authorized 45,787,948 45,787,948
Ordinary shares, shares issued 45,787,948 45,787,948
Ordinary shares, shares outstanding 45,787,948 45,787,948
Parent Company [Member]    
Condensed Financial Statements, Captions [Line Items]    
Treasury Stock, Shares 12,111,537 12,175,155
Parent Company [Member] | Common Class A [Member]    
Condensed Financial Statements, Captions [Line Items]    
Ordinary shares, par value per share $ 0.0001 $ 0.0001
Ordinary shares, shares authorized 500,000,000 500,000,000
Ordinary shares, shares issued 142,353,532 142,353,532
Ordinary shares, shares outstanding 84,454,047 84,390,429
Parent Company [Member] | Common Class B [Member]    
Condensed Financial Statements, Captions [Line Items]    
Ordinary shares, par value per share $ 0.0001 $ 0.0001
Ordinary shares, shares authorized 45,787,948 45,787,948
Ordinary shares, shares issued 45,787,948 45,787,948
Ordinary shares, shares outstanding 45,787,948 45,787,948