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Earnings per share (Tables) | 6 Months Ended
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Jun. 30, 2019
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, 2019 and 2018 were as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Net income for the computation of basic EPS | $ | 331,460 |  |  | $ | 254,240 |  |  | $ | 565,646 |  |  | $ | 519,639 |
Weighted average ordinary shares outstanding - basic | 135,917,192 |  |  | 145,272,520 |  |  | 137,029,147 |  |  | 146,228,245 |
Basic EPS | $ | 2.44 |  |  | $ | 1.75 |  |  | $ | 4.13 |  |  | $ | 3.55 |
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Net income for the computation of diluted EPS | $ | 331,460 |  |  | $ | 254,240 |  |  | $ | 565,646 |  |  | $ | 519,639 |
Weighted average ordinary shares outstanding - diluted | 137,072,268 |  |  | 149,474,890 |  |  | 138,396,628 |  |  | 151,858,686 |
Diluted EPS | $ | 2.42 |  |  | $ | 1.70 |  |  | $ | 4.09 |  |  | $ | 3.42 |
Schedule of computation of ordinary shares outstanding, excluding unvested restricted stock | Ordinary shares outstanding, excluding shares of unvested restricted stock, as of June 30, 2019 and December 31, 2018 were as follows:
| June 30, 2019 |  | December 31, 2018
| Number of ordinary shares
Ordinary shares issued | 146,847,345 |  |  | 151,847,345 |
Treasury shares | (10,244,359 | ) |  | (9,172,681 | )
Ordinary shares outstanding | 136,602,986 |  |  | 142,674,664 |
Shares of unvested restricted stock | (2,250,655 | ) |  | (2,429,442 | )
Ordinary shares outstanding, excluding shares of unvested restricted stock | 134,352,331 |  |  | 140,245,222 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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