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Basic and Diluted Earnings per Share | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Basic and Diluted Earnings per Share | Basic and Diluted Earnings per Share Diluted earnings attributable to shareholders per share is computed using the weighted average number of common shares and dilutive potential common shares outstanding. Dilutive potential shares represent outstanding stock options, including purchase options under the Company's employee stock purchase plan and unvested restricted stock units. Basic earnings attributable to shareholders per share is calculated using the weighted average number of common shares outstanding without taking into consideration dilutive potential common shares outstanding. The following table reconciles the numerator and the denominator of the basic and diluted per share computations for earnings attributable to shareholders:
| Three months ended
| September 30,
(Amounts in thousands, except per share amounts) | Net earnings attributable to shareholders |  | Weighted average shares |  | Earnings per share
2018 |  |  |  |  |
Basic earnings attributable to shareholders | $ | 162,692 |  |  | 173,394 |  |  | $ | 0.94 |
Effect of dilutive potential common shares | — |  |  | 3,779 |  |  | — |
Diluted earnings attributable to shareholders | $ | 162,692 |  |  | 177,173 |  |  | $ | 0.92 |
2017 |  |  |  |  |
Basic earnings attributable to shareholders | $ | 120,263 |  |  | 179,416 |  |  | $ | 0.67 |
Effect of dilutive potential common shares | — |  |  | 2,372 |  |  | — |
Diluted earnings attributable to shareholders | $ | 120,263 |  |  | 181,788 |  |  | $ | 0.66 |
| Nine months ended
| September 30,
(Amounts in thousands, except per share amounts) | Net earnings attributable to shareholders |  | Weighted average shares |  | Earnings per share
2018 |  |  |  |  |
Basic earnings attributable to shareholders | $ | 438,989 |  |  | 174,675 |  |  | $ | 2.51 |
Effect of dilutive potential common shares | — |  |  | 3,772 |  |  | — |
Diluted earnings attributable to shareholders | $ | 438,989 |  |  | 178,447 |  |  | $ | 2.46 |
2017 |  |  |  |  |
Basic earnings attributable to shareholders | $ | 322,378 |  |  | 179,827 |  |  | $ | 1.79 |
Effect of dilutive potential common shares | — |  |  | 2,124 |  |  | — |
Diluted earnings attributable to shareholders | $ | 322,378 |  |  | 181,951 |  |  | $ | 1.77 |

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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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