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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Schedule of computations of basic and diluted earnings per share | The computations of basic and diluted EPS for the years ended December 31, 2019, 2018 and 2017 were as follows:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Net income for the computation of basic EPS | $ | 1,145,694 |  |  | $ | 1,015,632 |  |  | $ | 1,076,151 |
Weighted average ordinary shares outstanding—basic | 134,570,169 |  |  | 145,162,220 |  |  | 161,059,552 |
Basic EPS | $ | 8.51 |  |  | $ | 7.00 |  |  | $ | 6.68 |
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Net income for the computation of diluted EPS | $ | 1,145,694 |  |  | $ | 1,015,632 |  |  | $ | 1,076,151 |
Weighted average ordinary shares outstanding—diluted | 135,898,139 |  |  | 148,706,266 |  |  | 167,287,508 |
Diluted EPS | $ | 8.43 |  |  | $ | 6.83 |  |  | $ | 6.43 |
Schedule of computation of ordinary shares outstanding, excluding unvested restricted stock | The computations of ordinary shares outstanding, excluding shares of unvested restricted stock, as of December 31, 2019, 2018 and 2017 were as follows:
| As of December 31,
| 2019 |  | 2018 |  | 2017
| Number of ordinary shares
Ordinary shares issued | 141,847,345 |  |  | 151,847,345 |  |  | 167,847,345 |
Treasury shares | (10,263,856 | ) |  | (9,172,681 | ) |  | (14,855,244 | )
Ordinary shares outstanding | 131,583,489 |  |  | 142,674,664 |  |  | 152,992,101 |
Shares of unvested restricted stock | (2,354,318 | ) |  | (2,429,442 | ) |  | (3,007,752 | )
Ordinary shares outstanding, excluding shares of unvested restricted stock | 129,229,171 |  |  | 140,245,222 |  |  | 149,984,349 |

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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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