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SHAREHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity Note [Abstract] |
COMMON SHARES ISSUED AND OUTSTANDING | The following table presents changes in common shares issued and outstanding, excluding restricted shares related to the Company's share-based compensation plans (see Note 16 'Share-Based Compensation'):
| Year ended December 31, | 2017 |  | 2016 |  | 2015 |
| Shares issued, balance at beginning of year | 176,580 |  |  | 176,240 |  |  | 175,478 |  |
| Shares issued | — |  |  | 340 |  |  | 762 |  |
| Total shares issued at end of year | 176,580 |  |  | 176,580 |  |  | 176,240 |  |
| Treasury shares, balance at beginning of year | (90,139 | ) |  | (80,174 | ) |  | (76,052 | ) |
| Shares repurchased | (4,288 | ) |  | (10,508 | ) |  | (4,616 | ) |
| Shares reissued | 1,008 |  |  | 543 |  |  | 494 |  |
| Total treasury shares at end of year | (93,419 | ) |  | (90,139 | ) |  | (80,174 | ) |
| Total shares outstanding | 83,161 |  |  | 86,441 |  |  | 96,066 |  |
SHARE REPURCHASES | The following table presents common share repurchased, from shares held in treasury:
| Year ended December 31, | 2017 |  | 2016 |  | 2015 |
| In the open market: |  |  |  |  |  |
| Total shares(1) | 3,932 |  |  | 10,241 |  |  | 4,264 |  |
| Total cost | $ | 261,180 |  |  | $ | 557,476 |  |  | $ | 246,490 |  |
| Average price per share(2) | $ | 66.43 |  |  | $ | 54.44 |  |  | $ | 57.80 |  |
| From employees:(3) |  |  |  |  |  |
| Total shares | 356 |  |  | 267 |  |  | 352 |  |
| Total cost | $ | 24,678 |  |  | $ | 14,329 |  |  | $ | 18,048 |  |
| Average price per share(2) | $ | 69.36 |  |  | $ | 53.74 |  |  | $ | 51.34 |  |
| Total shares repurchased: |  |  |  |  |  |
| Total shares | 4,288 |  |  | 10,508 |  |  | 4,616 |  |
| Total cost | $ | 285,858 |  |  | $ | 571,805 |  |  | $ | 264,538 |  |
| Average price per share(2) | $ | 66.67 |  |  | $ | 54.42 |  |  | $ | 57.32 |  |
(1) | Amounts in 2016 and 2015 include common shares acquired under the accelerated share repurchase program of 1,358,380 and 4,149,378, respectively (see below for more detail).
(2) | Calculated using whole numbers.
(3) | Shares are repurchased from employees to satisfy withholding tax liabilities upon the vesting of restricted stock awards, restricted stock units, and the exercise of stock options. Share repurchases from employees are excluded from the authorized share repurchase plan noted above.

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