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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.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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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.

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The number of new shares issued in the conversion of stock 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.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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