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Long-term borrowings (Details) ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) item | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CNY (¥)
Debt Instrument |  |  |  |
Proceeds from long-term borrowings |  |  | $ 420,417 | ¥ 2,890,575
Term and Revolving Credit Facilities |  |  |  |
Debt Instrument |  |  |  |
Term (in years) |  | 5 years |  |
Maximum borrowing capacity under facilities |  | $ 1,000,000 |  |
Number of arrangers | item |  | 24 |  |
Proceeds from long-term borrowings | $ 450,000 |  |  |
Term and Revolving Credit Facilities | LIBOR |  |  |  |
Debt Instrument |  |  |  |
Basis Spread (as a percent) |  | 1.15% |  |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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