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Share repurchase program (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2016 CNY (¥) shares
Repurchase of shares cost | ¥ |  |  |  |  | ¥ 5,882,156
ADS |  |  |  |  |
Authorized amount | $ 1,000,000 |  |  |  |
Repurchase period (in months) | 24 months |  |  |  |
Shares repurchased during the year (in ADS shares) | shares |  |  |  | 31,065,784 | 31,065,784
Repurchase of shares cost |  |  |  | $ 800,000 |
Weighted average repurchase price (in dollars per ADS) | $ / shares |  |  |  | $ 25.75 |
Payments under share repurchase program involving capped call options |  |  |  | $ 300,000 |
Proceeds from settlements under share repurchase program, involving capped call options |  | $ 107,239 | ¥ 737,501 | $ 216,220 | ¥ 1,463,218

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- Definition The cash outflow related to the aggregate price paid to enter into share repurchase agreements involving capped call options. + References No definition available. + Details
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- Definition The cash inflow related to the proceeds from settlements under share repurchase program, involving capped call options. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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