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PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION (Condensed balance Sheets) (Parenthetical) (Details) - $ / shares | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |
Treasury Stock, Shares | 12,175,155 | 12,261,555
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 | 84,390,429 | 130,091,977
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 | 0
Ordinary shares, shares outstanding | 45,787,948 | 0
Parent Company [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Treasury Stock, Shares | 12,175,155 | 12,261,555
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 | 84,390,429 | 130,091,977
Parent Company [Member] | Common Class B [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Ordinary shares, par value per share |  | $ 0.0001
Ordinary shares, shares authorized |  | 45,787,948
Ordinary shares, shares issued | 45,787,948 |
Ordinary shares, shares outstanding | 45,787,948 |

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