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SHAREHOLDERS' EQUITY (Tables) | 9 Months Ended
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Sep. 30, 2018
Stockholders' Equity Note [Abstract] |
COMMON SHARES ISSUED AND OUTSTANDING | The following table presents common shares issued and outstanding:
|  | Three months ended September 30, |  | Nine months ended September 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
| 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 | (93,024 | ) |  | (93,377 | ) |  | (93,419 | ) |  | (90,139 | ) |
| Shares repurchased | — |  |  | (51 | ) |  | (175 | ) |  | (4,284 | ) |
| Shares reissued | 1 |  |  | 5 |  |  | 571 |  |  | 1,000 |  |
| Total treasury shares at end of period | (93,023 | ) |  | (93,423 | ) |  | (93,023 | ) |  | (93,423 | ) |
| Total shares outstanding | 83,557 |  |  | 83,157 |  |  | 83,557 |  |  | 83,157 |  |
SHARE REPURCHASES | The following table presents share repurchases:
|  | Three months ended September 30, |  | Nine months ended September 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
| In the open market: |  |  |  |  |  |  |  |
| Total shares | — |  |  | 49 |  |  | — |  |  | 3,932 |  |
| Total cost | $ | — |  |  | $ | 3,237 |  |  | $ | — |  |  | $ | 261,180 |  |
| Average price per share(1) | $ | — |  |  | $ | 65.80 |  |  | $ | — |  |  | $ | 66.43 |  |
| From employees:(2) |  |  |  |  |  |  |  |
| Total shares | — |  |  | 2 |  |  | 175 |  |  | 352 |  |
| Total cost | $ | — |  |  | $ | 110 |  |  | $ | 8,699 |  |  | $ | 24,479 |  |
| Average price per share(1) | $ | — |  |  | $ | 64.04 |  |  | $ | 49.57 |  |  | $ | 69.53 |  |
| Total shares repurchased: |  |  |  |  |  |  |  |
| Total shares | — |  |  | 51 |  |  | 175 |  |  | 4,284 |  |
| Total cost | $ | — |  |  | $ | 3,347 |  |  | $ | 8,699 |  |  | $ | 285,659 |  |
| Average price per share(1) | $ | — |  |  | $ | 65.74 |  |  | $ | 49.57 |  |  | $ | 66.68 |  |
(1) Calculated using whole numbers.
(2) | Shares are repurchased from employees to satisfy withholding tax liabilities related to the vesting of restricted stock units.

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