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Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of retained earnings


		As of December 31,
		2016				2017
		RMB				RMB				US$
PRC statutory reserve funds			31,824				39,638				6,092
Unreserved retained earnings			205,469				1,525,245				234,426

Total retained earnings			237,293				1,564,883				240,518

Schedule of components of accumulated other comprehensive income


		Foreign currency translation adjustments				Unrealized gains on available- for-sale securities				Total
						RMB				RMB
Balance at January 1,2015			(15,726	)			17,927				2,201

Other comprehensive income before reclassification			115,515				9,729				125,244
Amounts reclassified from accumulated other comprehensive income			—				(6,814	)			(6,814	)
Other comprehensive loss attribute to noncontrolling interests			(1,515	)			—				(1,515	)

Balance at December 31, 2015			98,274				20,842				119,116

Other comprehensive income before reclassification			132,450				1,241				133,691
Amounts reclassified from accumulated other comprehensive income			—				(21,666	)			(21,666	)
Other comprehensive loss attribute to noncontrolling interests			(2,996	)			—				(2,996	)

Balance at December 31, 2016			227,728				417				228,145

Other comprehensive income before reclassification			(148,304	)			(433	)			(148,737	)
Other comprehensive loss attribute to noncontrolling interests			4,798				—				4,798

Balance at December 31, 2017			84,222				(16	)			84,206

Balance at December 31, 2017, in US$			12,945				(2	)			12,943