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EARNINGS PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings per share [abstract] |
Earnings per share | Reconciliation between basic and diluted earnings per share is as follows:
|  | 2017 |  |  | 2016 |
Net earnings - basic and diluted | $ | 362,334 |  |  | $ | 346,638 |
Basic earnings per share: |  |  |
| Basic weighted average number of common shares outstanding | 224,184 |  |  | 235,355 |
Basic earnings per share | $ | 1.62 |  |  | $ | 1.47 |
Diluted earnings per share: |  |  |
| Basic weighted average number of common shares outstanding | 224,184 |  |  | 235,355 |
| Plus dilutive impact of stock options, Treasury RSUs and common |  |  |
| shares held in trust | 351 |  |  | 693 |
| Diluted weighted average number of common shares outstanding | 224,535 |  |  | 236,048 |
Diluted earnings per share | $ | 1.61 |  |  | $ | 1.47 |

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