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Earnings per share | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Earnings per share | Earnings per share Basic EPS is calculated by dividing net income by the weighted average number of our ordinary shares outstanding, which excludes 2,354,318, 2,429,442 and 3,007,752 shares of unvested restricted stock as of December 31, 2019, 2018 and 2017, respectively. For the calculation of diluted EPS, the weighted average of our ordinary shares outstanding for basic EPS is adjusted by the effect of dilutive securities provided under our equity compensation plans. The number of ordinary shares excluded from diluted shares outstanding was 163,067, 90,929 and 509,677 for the years ended December 31, 2019, 2018 and 2017, respectively, because the effect of including those shares in the calculation would have been anti-dilutive. 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 |
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 The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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