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SHAREHOLDERS' EQUITY (Tables) | 3 Months Ended
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Mar. 31, 2019
Stockholders' Equity Note [Abstract] |
COMMON SHARES ISSUED AND OUTSTANDING | The following table presents changes in common shares issued and outstanding:
|  | Three months ended March 31, |
|  | 2019 |  | 2018 |
| Shares issued, balance at beginning of period | 176,580 |  |  | 176,580 |  |
| Shares issued | — |  |  | — |  |
| Total shares issued at end of period | 176,580 |  |  | 176,580 |  |
| Treasury shares, balance at beginning of period | (92,994 | ) |  | (93,419 | ) |
| Shares repurchased | (157 | ) |  | (149 | ) |
| Shares reissued | 505 |  |  | 506 |  |
| Total treasury shares at end of period | (92,646 | ) |  | (93,062 | ) |
| Total shares outstanding | 83,934 |  |  | 83,518 |  |
SHARE REPURCHASES | The following table presents common share repurchased from shares held in Treasury:
|  | Three months ended March 31, |
|  | 2019 |  | 2018 |
| In the open market: |  |  |  |
| Total shares | — |  |  | — |  |
| Total cost | $ | — |  |  | $ | — |  |
| Average price per share(1) | $ | — |  |  | $ | — |  |
| From employees:(2) |  |  |  |
| Total shares | 157 |  |  | 149 |  |
| Total cost | $ | 9,003 |  |  | $ | 7,163 |  |
| Average price per share(1) | $ | 57.17 |  |  | $ | 48.08 |  |
| Total shares repurchased: |  |  |  |
| Total shares | 157 |  |  | 149 |  |
| Total cost | $ | 9,003 |  |  | $ | 7,163 |  |
| Average price per share(1) | $ | 57.17 |  |  | $ | 48.08 |  |
(1) Calculated using whole numbers.
(2) | Shares are repurchased from employees to satisfy withholding tax liabilities related to the vesting of share-settled restricted stock units.

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