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Net income per ordinary share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Reconciliation of Number of Shares Used in Computation of Basic and Diluted Net Income Per Ordinary Share | The reconciliation of the number of shares used in the computation of basic and diluted net income per ordinary share is as follows:
| Three Months Ended |  | Six Months Ended
| June 30, 2018 |  |  | June 30, 2017 |  |  | June 30, 2018 |  |  | June 30, 2017 |
Weighted average number of ordinary shares outstanding for basic net income per ordinary share | 54,109,702 |  |  | 53,846,544 |  |  | 54,017,631 |  |  | 54,109,800 |
Effect of dilutive share options outstanding | 742,751 |  |  | 684,261 |  |  | 857,820 |  |  | 813,219 |
Weighted average number of ordinary shares outstanding for diluted net income per ordinary share | 54,852,453 |  |  | 54,530,805 |  |  | 54,875,451 |  |  | 54,923,019 |

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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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