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Earnings per share (Tables) | 6 Months Ended
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Jun. 30, 2020
Earnings Per Share [Abstract] |
Schedule of computations of basic and diluted earnings per share | Basic and diluted EPS for the three and six months ended June 30, 2020 and 2019 were as follows:
| Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Net income for the computation of basic EPS | $ | 246,061 |  |  | $ | 331,460 |  |  | $ | 522,885 |  |  | $ | 565,646 |
Weighted average ordinary shares outstanding - basic | 127,425,886 |  |  | 135,917,192 |  |  | 127,862,816 |  |  | 137,029,147 |
Basic EPS | $ | 1.93 |  |  | $ | 2.44 |  |  | $ | 4.09 |  |  | $ | 4.13 |
| Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Net income for the computation of diluted EPS | $ | 246,061 |  |  | $ | 331,460 |  |  | $ | 522,885 |  |  | $ | 565,646 |
Weighted average ordinary shares outstanding - diluted | 128,131,663 |  |  | 137,072,268 |  |  | 128,938,138 |  |  | 138,396,628 |
Diluted EPS | $ | 1.92 |  |  | $ | 2.42 |  |  | $ | 4.06 |  |  | $ | 4.09 |
Schedule of computation of ordinary shares outstanding, excluding unvested restricted stock | Ordinary shares outstanding, excluding shares of unvested restricted stock, as of June 30, 2020 and December 31, 2019 were as follows:
| June 30, 2020 |  | December 31, 2019
| Number of ordinary shares |  |
Ordinary shares issued | 138,847,345 |  |  | 141,847,345 |
Treasury shares | (9,174,562) |  |  | (10,263,856) |
Ordinary shares outstanding | 129,672,783 |  |  | 131,583,489 |
Shares of unvested restricted stock | (2,087,383) |  |  | (2,354,318) |
Ordinary shares outstanding, excluding shares of unvested restricted stock | 127,585,400 |  |  | 129,229,171 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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