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Additional information: condensed financial statements of the Company (Condensed statements of cash flows) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥)
Cash flows from investing activities |  |  |  |
Net cash used in investing activities | ¥ (1,783,138) | $ (256,824) | ¥ (1,048,022) | ¥ (3,954,055)
Cash flows from financing activities |  |  |  |
Proceeds from issuance of convertible bonds |  |  |  | 2,402,549
Net cash provided by financing activities | 10,651 | 1,534 | (337,143) | 2,402,762
Cash and cash equivalents at the beginning of the year | 928,934 | 133,794 | 475,028 | 729,598
Cash and cash equivalents at the end of the year | 1,579,743 | 227,530 | 928,934 | 475,028
Parent [Member] |  |  |  |
Cash flows from investing activities |  |  |  |
Loan to a subsidiary |  |  |  | (2,412,290)
Net cash used in investing activities |  |  |  | (2,412,290)
Cash flows from financing activities |  |  |  |
Proceeds from issuance of convertible bonds |  |  |  | 2,412,290
Net cash provided by financing activities |  |  |  | 2,412,290
Net increase in cash and cash equivalents |  |  |  |
Cash and cash equivalents at the beginning of the year |  |  |  |
Cash and cash equivalents at the end of the year |  |  |  |

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