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SHAREHOLDERS' EQUITY (Narrative) (Details) $ / shares in Units, ¥ in Thousands |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 11, 2015 $ / shares | Aug. 10, 2015 USD ($) $ / shares | Sep. 30, 2015 CNY (¥) | Jan. 27, 2015 shares | Dec. 31, 2018 shares | Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2017 shares
Consideration to repurchase shares | $ |  |  |  |  |  |  | $ 4,542 | $ 3,111 |
Shares repurchased |  |  |  |  |  | 967,408 | 967,408 | 614,033 |
Amount of dividend paid | ¥ |  |  | ¥ 288,157 |  |  | ¥ 285,829 |  |  |
Special dividend per share | $ / shares | $ 0.33 |  |  |  |  |  |  |  |
Ordinary shares [Member] |  |  |  |  |  |  |  |  |
Shares repurchased |  |  |  |  |  | 2,902,224 | 2,902,224 | 1,842,099 |
American Depositary Shares [Member] |  |  |  |  |  |  |  |  |
Consideration to repurchase shares | $ |  | $ 20,000,000 |  |  |  |  |  |  |
American Depositary Shares [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Price per share | $ / shares |  | $ 7.99 |  |  |  |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  | 45,787,948 | 45,787,948 |  |  |  |
Common Stock, Shares, Outstanding |  |  |  |  | 84,390,429 |  |  |  | 130,091,977
Common Class B [Member] |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued |  |  |  | 45,787,948 | 45,787,948 |  |  |  |
Common Stock, Shares, Outstanding |  |  |  |  | 45,787,948 |  |  |  | 0

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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