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SHAREHOLDERS' EQUITY (Tables) | 6 Months Ended
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Jun. 30, 2019
Stockholders' Equity Note [Abstract] |
COMMON SHARES ISSUED AND OUTSTANDING | The following table presents changes in common shares issued and outstanding:
|  | Three months ended June 30, |  | Six months ended June 30, |
|  | 2019 |  | 2018 |  | 2019 |  | 2018 |
| Shares issued, balance at beginning of period | 176,580 |  |  | 176,580 |  |  | 176,580 |  |  | 176,580 |  |
| Shares issued | — |  |  | — |  |  | — |  |  | — |  |
| Total shares issued at end of period | 176,580 |  |  | 176,580 |  |  | 176,580 |  |  | 176,580 |  |
| Treasury shares, balance at beginning of period | (92,646 | ) |  | (93,062 | ) |  | (92,994 | ) |  | (93,419 | ) |
| Shares repurchased | (7 | ) |  | (26 | ) |  | (164 | ) |  | (175 | ) |
| Shares reissued | 20 |  |  | 64 |  |  | 525 |  |  | 570 |  |
| Total treasury shares at end of period | (92,633 | ) |  | (93,024 | ) |  | (92,633 | ) |  | (93,024 | ) |
| Total shares outstanding | 83,947 |  |  | 83,556 |  |  | 83,947 |  |  | 83,556 |  |
SHARE REPURCHASES | The following table presents common share repurchased from shares held in Treasury:
|  | Three months ended June 30, |  | Six months ended June 30, |
|  | 2019 |  | 2018 |  | 2019 |  | 2018 |
| In the open market: |  |  |  |  |  |  |  |
| Total shares | — |  |  | — |  |  | — |  |  | — |  |
| Total cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |
| Average price per share(1) | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |
| From employees:(2) |  |  |  |  |  |  |  |
| Total shares | 7 |  |  | 26 |  |  | 164 |  |  | 175 |  |
| Total cost | $ | 411 |  |  | $ | 1,512 |  |  | $ | 9,414 |  |  | $ | 8,676 |  |
| Average price per share(1) | $ | 58.34 |  |  | $ | 57.97 |  |  | $ | 57.22 |  |  | $ | 49.56 |  |
| Total shares repurchased: |  |  |  |  |  |  |  |
| Total shares | 7 |  |  | 26 |  |  | 164 |  |  | 175 |  |
| Total cost | $ | 411 |  |  | $ | 1,512 |  |  | $ | 9,414 |  |  | $ | 8,676 |  |
| Average price per share(1) | $ | 58.34 |  |  | $ | 57.97 |  |  | $ | 57.22 |  |  | $ | 49.56 |  |
(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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