Amount of amortization expense attributable to debt issuance costs.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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- Definition

The cash inflow from borrowing by issuing commercial paper.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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, 2017 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	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					¥ 1,092	$ 160
Interest expense					15,008	2,199
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					961	140
Interest expense					¥ 12,560	$ 1,826