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SHAREHOLDERS' EQUITY (Tables) | 9 Months Ended
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Sep. 30, 2017
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, |
|  | 2017 |  | 2016 |  | 2017 |  | 2016 |
| Shares issued, balance at beginning of period | 176,580 |  |  | 176,575 |  |  | 176,580 |  |  | 176,240 |  |
| Shares issued | — |  |  | — |  |  | — |  |  | 335 |  |
| Total shares issued at end of period | 176,580 |  |  | 176,575 |  |  | 176,580 |  |  | 176,575 |  |
| Treasury shares, balance at beginning of period | (93,377 | ) |  | (85,921 | ) |  | (90,139 | ) |  | (80,174 | ) |
| Shares repurchased | (51 | ) |  | (2,252 | ) |  | (4,284 | ) |  | (8,499 | ) |
| Shares reissued from treasury | 5 |  |  | 37 |  |  | 1,000 |  |  | 537 |  |
| Total treasury shares at end of period | (93,423 | ) |  | (88,136 | ) |  | (93,423 | ) |  | (88,136 | ) |
| Total shares outstanding | 83,157 |  |  | 88,439 |  |  | 83,157 |  |  | 88,439 |  |
SHARE REPURCHASES | The following table presents share repurchases:
|  | Three months ended September 30, |  | Nine months ended September 30, |
|  | 2017 |  | 2016 |  | 2017 |  | 2016 |
| In the open market: |  |  |  |  |  |  |  |
| Total shares(1) | 49 |  |  | 2,232 |  |  | 3,932 |  |  | 8,236 |  |
| Total cost | $ | 3,237 |  |  | $ | 124,948 |  |  | $ | 261,180 |  |  | $ | 434,948 |  |
| Average price per share(2) | $ | 65.80 |  |  | $ | 56.00 |  |  | $ | 66.43 |  |  | $ | 52.81 |  |
| From employees:(3) |  |  |  |  |  |  |  |
| Total shares | 2 |  |  | 20 |  |  | 352 |  |  | 263 |  |
| Total cost | $ | 110 |  |  | $ | 1,088 |  |  | $ | 24,479 |  |  | $ | 14,137 |  |
| Average price per share(2) | $ | 64.04 |  |  | $ | 54.13 |  |  | $ | 69.53 |  |  | $ | 53.68 |  |
| Total shares repurchased: |  |  |  |  |  |  |  |
| Total shares | 51 |  |  | 2,252 |  |  | 4,284 |  |  | 8,499 |  |
| Total cost | $ | 3,347 |  |  | $ | 126,036 |  |  | $ | 285,659 |  |  | $ | 449,085 |  |
| Average price per share(2) | $ | 65.74 |  |  | $ | 55.98 |  |  | $ | 66.68 |  |  | $ | 52.84 |  |
(1) | Total shares repurchased in the open market for the nine months ended September 30, 2016 includes 1,358,380 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 the vesting of restricted stock and restricted stock units.

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