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Earnings per share (Tables) | 6 Months Ended
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Jun. 30, 2021
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, 2021 and 2020 were as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30, |  |
| 2021 |  | 2020 |  | 2021 |  | 2020 |  |  |  |
Net income for the computation of basic EPS | $ | 249,751 |  |  | $ | 246,061 |  |  | $ | 477,776 |  |  | $ | 522,885 |  |  |  |  |
Weighted average ordinary shares outstanding - basic | 128,243,450 |  |  | 127,425,886 |  |  | 128,064,564 |  |  | 127,862,816 |  |  |  |  |
Basic EPS | $ | 1.95 |  |  | $ | 1.93 |  |  | $ | 3.73 |  |  | $ | 4.09 |  |  |  |  |
| Three Months Ended June 30, |  | Six Months Ended June 30, |  |
| 2021 |  | 2020 |  | 2021 |  | 2020 |  |  |  |
Net income for the computation of diluted EPS | $ | 249,751 |  |  | $ | 246,061 |  |  | $ | 477,776 |  |  | $ | 522,885 |  |  |  |  |
Weighted average ordinary shares outstanding - diluted | 129,896,210 |  |  | 128,131,663 |  |  | 129,690,334 |  |  | 128,938,138 |  |  |  |  |
Diluted EPS | $ | 1.92 |  |  | $ | 1.92 |  |  | $ | 3.68 |  |  | $ | 4.06 |  |  |  |  |
Schedule of computation of ordinary shares outstanding, excluding unvested restricted stock | Ordinary shares outstanding, excluding shares of unvested restricted stock, as of June 30, 2021 and December 31, 2020 were as follows:
| June 30, 2021 |  | December 31, 2020
| Number of ordinary shares
Ordinary shares issued | 138,847,345 |  |  | 138,847,345 |
Treasury shares | (5,468,457) |  |  | (8,448,807) |
Ordinary shares outstanding | 133,378,888 |  |  | 130,398,538 |
Shares of unvested restricted stock | (5,254,512) |  |  | (2,552,346) |
Ordinary shares outstanding, excluding shares of unvested restricted stock | 128,124,376 |  |  | 127,846,192 |

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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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