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Net Income per Share (Tables) | 12 Months Ended
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Dec. 31, 2014
Computation of Basic and Diluted Net Income per Share Attributable to Ordinary Shareholders | The following table sets forth the computation of basic and diluted net income per share attributable to ordinary shareholders:
|  | Years Ended December 31, |
|  | 2012 |  |  | 2013 |  |  | 2014 |
Net income attributable to ordinary shareholders—basic and diluted |  |  | 22,826,454 |  |  |  | 51,435,171 |  |  |  | 72,406,504 |
Weighted average number of ordinary shares outstanding—basic |  |  | 27,751,335 |  |  |  | 27,480,150 |  |  |  | 27,873,501 |
Plus: share options |  |  | 249,756 |  |  |  | 229,339 |  |  |  | 178,203 |
Plus: non-vested restricted shares |  |  | 72,640 |  |  |  | 298,897 |  |  |  | 176,119 |
Weighted average number of ordinary shares outstanding—diluted |  |  | 28,073,731 |  |  |  | 28,008,386 |  |  |  | 28,227,823 |
Basic net income per share |  |  | 0.82 |  |  |  | 1.87 |  |  |  | 2.60 |
Diluted net income per share |  |  | 0.81 |  |  |  | 1.84 |  |  |  | 2.57 |
Antidilutive Securities Excluded from Computation of Earning Per Share | Diluted net income per share does not include the following instruments as their inclusion would be antidilutive:
|  | Years Ended December 31, |
|  | 2012 |  |  | 2013 |  |  | 2014 |
Share options |  |  | 121,784 |  |  |  | 20,000 |  |  |  | 304,045 |
Restricted shares |  |  | 448,648 |  |  |  | 2,994 |  |  |  | — |
Total |  |  | 570,432 |  |  |  | 22,994 |  |  |  | 304,045 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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