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Common shares (Details) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 21, 2012 shares | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 shares | Dec. 31, 2013 shares
Share repurchase program approved on May 4, 2014 and March 5, 2015 [Member] |  |  |  |  |  |
Common shares [Line Items] |  |  |  |  |  |
Number of share repurchase programs |  | 2 |  |  |  |
Share repurchase program authorized amount | $ |  | $ 200,000,000 |  |  |  |
Average purchase price per share | $ / shares |  |  |  | $ 54.82 |  |
Shares repurchased value | $ |  |  |  | $ 169,500,000 |  |
Share repurchase programs, shares |  |  |  | 3,092,556 |  |
Class A common shares [Member] |  |  |  |  |  |
Common shares [Line Items] |  |  |  |  |  |
Issuance of common shares (in shares) | 179,400,000 |  |  |  | 25,036,140 |
Issuance costs of common stock | $ |  |  | $ 11,887,180 | $ 26,110,680 |  |
Common shares, shares authorized |  |  | 10,000,000,000 | 10,000,000,000 | 10,000,000,000 |
Common shares, shares issued |  |  | 750,115,028 | 728,227,848 | 706,173,568 |
Common shares, shares outstanding |  |  | 750,115,028 | 728,227,848 | 706,173,568 |
Class B common shares [Member] |  |  |  |  |  |
Common shares [Line Items] |  |  |  |  |  |
Common shares, shares authorized |  |  | 1,000,000,000 | 1,000,000,000 | 1,000,000,000 |
Common shares, shares issued |  |  | 359,557,976 | 369,557,976 | 427,352,696 |
Common shares, shares outstanding |  |  | 359,557,976 | 369,557,976 | 427,352,696 |
Common shares [Member] |  |  |  |  |  |
Common shares [Line Items] |  |  |  |  |  |
Conversion of Stock, Shares Converted | 548,408,914 |  |  |  |  |
Common shares [Member] | Share repurchase program approved on May 4, 2014 and March 5, 2015 [Member] |  |  |  |  |  |
Common shares [Line Items] |  |  |  |  |  |
Average purchase price per share | $ / shares |  |  |  | $ 2.74 |  |
Share repurchase programs, shares |  |  |  | 61,851,120 |  |
Common shares [Member] | Class A common shares [Member] |  |  |  |  |  |
Common shares [Line Items] |  |  |  |  |  |
Common shares, shares outstanding |  |  | 750,115,028 | 728,227,848 | 706,173,568 | 622,658,738
Common shares [Member] | Class B common shares [Member] |  |  |  |  |  |
Common shares [Line Items] |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  | 10,000,000 | 57,794,720 | 58,478,690 |
Common shares, shares outstanding |  |  | 359,557,976 | 369,557,976 | 427,352,696 | 485,831,386

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: 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 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: 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 + Details
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: 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 2: 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=6928386&loc=d3e21463-112644 + Details
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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 + Details
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