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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017, 2016 and 2015 were as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Net income for the computation of basic EPS | $ | 1,076,151 |  |  | $ | 1,046,630 |  |  | $ | 1,178,730 |
Weighted average ordinary shares outstanding—basic | 161,059,552 |  |  | 185,514,370 |  |  | 203,850,828 |
Basic EPS | $ | 6.68 |  |  | $ | 5.64 |  |  | $ | 5.78 |
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Net income for the computation of diluted EPS | $ | 1,076,151 |  |  | $ | 1,046,630 |  |  | $ | 1,178,730 |
Weighted average ordinary shares outstanding—diluted | 167,287,508 |  |  | 189,682,036 |  |  | 206,224,135 |
Diluted EPS | $ | 6.43 |  |  | $ | 5.52 |  |  | $ | 5.72 |
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, 2017, 2016 and 2015 were as follows:
| As of December 31,
| 2017 |  | 2016 |  | 2015
| Number of ordinary shares
Ordinary shares issued | 167,847,345 |  |  | 187,847,345 |  |  | 203,411,207 |
Treasury shares | (14,855,244 | ) |  | (11,600,191 | ) |  | (3,069,003 | )
Ordinary shares outstanding | 152,992,101 |  |  | 176,247,154 |  |  | 200,342,204 |
Shares of unvested restricted stock | (3,007,752 | ) |  | (3,426,810 | ) |  | (3,030,724 | )
Ordinary shares outstanding, excluding shares of unvested restricted stock | 149,984,349 |  |  | 172,820,344 |  |  | 197,311,480 |

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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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