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Income Taxes (Combined effects of income tax expense exemption and other preferential tax benefits) (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 CNY (¥) ¥ / shares	Dec. 31, 2016 USD ($) $ / shares	Dec. 31, 2015 CNY (¥) ¥ / shares	Dec. 31, 2014 CNY (¥) ¥ / shares
Income Taxes [Abstract]
Preferential tax rate effect	¥ 9,878	$ 1,423	¥ 10,073	¥ 41,157
Basic net income per share effect | (per share)	¥ 0.02	$ 0.002	¥ 0.02	¥ 0.07

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- References

No definition available.

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- Definition

The amount of income taxes from which a reporting entity is exempt or for which it will receive a reduction in income taxes as a result of the income tax holiday granted by the taxing jurisdiction.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330215-122817

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- Definition

Per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330215-122817

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