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Share repurchase program (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
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Dec. 31, 2018 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2019 CNY (¥) shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2018 CNY (¥) shares | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2016 CNY (¥) shares
Repurchase of shares cost | ¥ |  |  |  |  |  |  |  | ¥ 737,501 |  |
Proceeds from settlement of capped call options | ¥ |  |  |  |  |  |  |  | 737,501 |  |
ADS |  |  |  |  |  |  |  |  |  |
Authorized amount | $ | $ 1,000,000 | $ 1,000,000 |  |  | $ 1,000,000 |  |  |  |  |
Shares repurchased total (in ADS shares) | shares |  |  | 2,332,048 | 2,332,048 |  |  |  |  |  |
Repurchase period (in months) | 12 months | 24 months |  |  |  |  |  |  |  |
Shares repurchased during the year (in ADS shares) | shares |  |  | 935,848 | 935,848 | 1,396,200 | 1,396,200 |  |  | 31,065,784 | 31,065,784
Repurchase of shares cost |  |  | $ 19,101 | ¥ 131,010 | $ 29,999 | ¥ 205,886 |  |  | $ 800,000 | ¥ 5,338,276
Weighted average repurchase price (in dollars per ADS) | $ / shares |  |  | $ 20.41 |  | $ 21.48 |  |  |  | $ 25.75 |
Payments under share repurchase program involving capped call options |  |  |  |  |  |  |  |  | $ 300,000 | 2,007,100
Proceeds from settlement of capped call options |  |  |  |  |  |  | $ 107,239 | ¥ 737,501 | $ 216,220 | ¥ 1,463,218

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- Definition Amount of increase to additional paid-in capital (APIC) from settlement of capped call options. + References No definition available. + Details
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- Definition The cash inflow from settlement of capped call options. + References No definition available. + Details
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- Definition Total shares repurchased under stock ​repurchase ​program. + 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://fasb.org/us-gaap/role/ref/legacyRef -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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