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Net income Per Ordinary Share (Tables) | 6 Months Ended
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Jun. 30, 2013
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, |  |  | June 30, |  |  | June 30, |  |  | June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Weighted average number of ordinary shares outstanding for basic net income per ordinary share |  |  | 60,724,296 |  |  |  | 59,978,509 |  |  |  | 60,555,945 |  |  |  | 60,032,306 |
Effect of dilutive share options outstanding |  |  | 1,174,607 |  |  |  | 652,382 |  |  |  | 1,051,812 |  |  |  | 575,329 |
Weighted average number of ordinary shares for diluted net income per ordinary share |  |  | 61,898,903 |  |  |  | 60,630,891 |  |  |  | 61,607,757 |  |  |  | 60,607,635 |

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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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