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SHORT-TERM COMMERCIAL PAPER (Details) ¥ in Thousands, $ in Thousands					12 Months Ended
	Sep. 23, 2016 CNY (¥)	Sep. 23, 2016 USD ($)	Sep. 05, 2016 CNY (¥)	Sep. 05, 2016 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2016 USD ($)	Sep. 23, 2016 USD ($)	Sep. 05, 2016 USD ($)
SHORT-TERM COMMERCIAL PAPER
Net proceeds from issuance of commercial paper						$ 134,311
Commercial paper maturing on September 2017
SHORT-TERM COMMERCIAL PAPER
Face amount			¥ 400,000					$ 60,000
Fixed interest rate (as a percent)			5.50%					5.50%
Debt term			1 year	1 year
Net proceeds from issuance of commercial paper			¥ 398,400	$ 59,900
Amortization of financing costs					¥ 508	73
Commercial paper maturing on June 2017
SHORT-TERM COMMERCIAL PAPER
Face amount	¥ 500,000						$ 74,800
Fixed interest rate (as a percent)	5.30%						5.30%
Debt term	9 months	9 months
Net proceeds from issuance of commercial paper	¥ 498,500	$ 74,700
Amortization of financing costs					539	78
Other payables | Commercial paper maturing on September 2017
SHORT-TERM COMMERCIAL PAPER
Interest expense					6,992	1,008
Other payables | Commercial paper maturing on June 2017
SHORT-TERM COMMERCIAL PAPER
Interest expense					¥ 7,042	$ 1,015

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Amount of amortization expense attributable to debt issuance costs.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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