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SHAREHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2019
Stockholders' Equity Note [Abstract] |
COMMON SHARES ISSUED AND OUTSTANDING | The following table presents changes in common shares issued and outstanding:
| Year ended December 31, | 2019 |  | 2018 |  | 2017 |
| Shares issued, balance at beginning of year | 176,580 |  |  | 176,580 |  |  | 176,580 |  |
| Shares issued | — |  |  | — |  |  | — |  |
| Total shares issued at end of year | 176,580 |  |  | 176,580 |  |  | 176,580 |  |
| Treasury shares, balance at beginning of year | (92,994 | ) |  | (93,419 | ) |  | (90,139 | ) |
| Shares repurchased | (176 | ) |  | (200 | ) |  | (4,288 | ) |
| Shares reissued | 549 |  |  | 625 |  |  | 1,008 |  |
| Total treasury shares at end of year | (92,621 | ) |  | (92,994 | ) |  | (93,419 | ) |
| Total shares outstanding | 83,959 |  |  | 83,586 |  |  | 83,161 |  |
SHARE REPURCHASES | The following table presents common shares repurchased from shares held in Treasury:
| Year ended December 31, | 2019 |  | 2018 |  | 2017 |
| In the open market: |  |  |  |  |  |
| Total shares | — |  |  | — |  |  | 3,932 |  |
| Total cost | $ | — |  |  | $ | — |  |  | $ | 261,180 |  |
| Average price per share(1) | $ | — |  |  | $ | — |  |  | $ | 66.43 |  |
| From employees:(2) |  |  |  |  |  |
| Total shares | 176 |  |  | 200 |  |  | 356 |  |
| Total cost | $ | 10,165 |  |  | $ | 10,080 |  |  | $ | 24,678 |  |
| Average price per share(1) | $ | 57.66 |  |  | $ | 50.40 |  |  | $ | 69.36 |  |
| Total shares repurchased: |  |  |  |  |  |
| Total shares | 176 |  |  | 200 |  |  | 4,288 |  |
| Total cost | $ | 10,165 |  |  | $ | 10,080 |  |  | $ | 285,858 |  |
| Average price per share(1) | $ | 57.66 |  |  | $ | 50.40 |  |  | $ | 66.67 |  |
(1) | Calculated using whole numbers.
(2) | Shares are repurchased from employees to satisfy withholding tax liabilities that arise on the vesting of share-settled restricted stock units.
SUMMARY OF DIVIDENDS DECLARED AND PAID | The following table presents dividends declared and paid related to the Company's common and preferred shares:
|  | Per share data |
|  | Dividends declared |  | Dividends paid in year of declaration |  | Dividends paid in year following declaration |
| Year ended December 31, 2017 |  |  |  |  |  |
| Common shares | $ | 1.53 |  |  | $ | 1.14 |  |  | $ | 0.39 |  |
| Series C preferred shares | $ | 0.43 |  |  | $ | 0.43 |  |  | $ | — |  |
| Series D preferred shares | $ | 1.38 |  |  | $ | 1.03 |  |  | $ | 0.34 |  |
| Series E preferred shares | $ | 137.50 |  |  | $ | 103.13 |  |  | $ | 34.38 |  |
| Year ended December 31, 2018 |  |  |  |  |  |
| Common shares | $ | 1.57 |  |  | $ | 1.17 |  |  | $ | 0.40 |  |
| Series D preferred shares | $ | 1.38 |  |  | $ | 1.03 |  |  | $ | 0.34 |  |
| Series E preferred shares | $ | 137.50 |  |  | $ | 103.13 |  |  | $ | 34.38 |  |
| Year ended December 31, 2019 |  |  |  |  |  |
| Common shares | $ | 1.61 |  |  | $ | 1.20 |  |  | $ | 0.41 |  |
| Series D preferred shares | $ | 1.21 |  |  | $ | 1.03 |  |  | $ | 0.18 |  |
| Series E preferred shares | $ | 137.50 |  |  | $ | 103.13 |  |  | $ | 34.38 |  |

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