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Net income per ordinary share | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Net income per ordinary share | Net income per ordinary share Basic net income per ordinary share has been computed by dividing net income available to ordinary shareholders by the weighted average number of ordinary shares outstanding during the period. Diluted net income per ordinary share is computed by adjusting the weighted average number of ordinary shares outstanding during the period for all potentially dilutive ordinary shares outstanding during the period and adjusting net income for any changes in income or loss that would result from the conversion of such potential ordinary shares. There is no difference in net income used for 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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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