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SHAREHOLDERS' EQUITY (TABLES) | 12 Months Ended
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Dec. 31, 2016
Stockholders' Equity Note [Abstract] |
COMMON SHARES ISSUED AND OUTSTANDING | The following table presents our common shares issued and outstanding, excluding restricted shares under our share-based compensation plans (refer to Note 16 'Share-based Compensation'):
| Year ended December 31, | 2016 |  | 2015 |  | 2014 |
| Shares issued, balance at beginning of year | 176,240 |  |  | 175,478 |  |  | 174,134 |  |
| Shares issued | 340 |  |  | 762 |  |  | 1,344 |  |
| Total shares issued at end of year | 176,580 |  |  | 176,240 |  |  | 175,478 |  |
| Treasury shares, balance at beginning of year | (80,174 | ) |  | (76,052 | ) |  | (64,649 | ) |
| Shares repurchased | (10,508 | ) |  | (4,616 | ) |  | (11,752 | ) |
| Shares reissued from treasury | 543 |  |  | 494 |  |  | 349 |  |
| Total treasury shares at end of year | (90,139 | ) |  | (80,174 | ) |  | (76,052 | ) |
| Total shares outstanding | 86,441 |  |  | 96,066 |  |  | 99,426 |  |
SHARE REPURCHASES | The following table presents our common share repurchase activities, which are held in treasury:
| Year ended December 31, | 2016 |  | 2015 |  | 2014 |
| In the open market: |  |  |  |  |  |
| Total shares(1) | 10,241 |  |  | 4,264 |  |  | 11,317 |  |
| Total cost | $ | 557,476 |  |  | $ | 246,490 |  |  | $ | 524,168 |  |
| Average price per share(2) | $ | 54.44 |  |  | $ | 57.80 |  |  | $ | 46.32 |  |
| From employees:(3) |  |  |  |  |  |
| Total shares | 267 |  |  | 352 |  |  | 435 |  |
| Total cost | $ | 14,329 |  |  | $ | 18,048 |  |  | $ | 19,034 |  |
| Average price per share(2) | $ | 53.74 |  |  | $ | 51.34 |  |  | $ | 43.82 |  |
| Total |  |  |  |  |  |
| Total shares | 10,508 |  |  | 4,616 |  |  | 11,752 |  |
| Total cost | $ | 571,805 |  |  | $ | 264,538 |  |  | $ | 543,202 |  |
| Average price per share(2) | $ | 54.42 |  |  | $ | 57.32 |  |  | $ | 46.22 |  |
(1) | Amounts in 2016 and 2015 include 1,358,380 and 4,149,378, respectively, of common shares acquired under the accelerated share repurchase program (see below for more detail).
(2) | Calculated using whole numbers.
(3) | To satisfy withholding tax liabilities upon vesting of restricted stock, restricted stock units, and exercise of stock options. Share repurchases from employees are excluded from the authorized share repurchase plans noted above.

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