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SHAREHOLDERS' EQUITY (Tables) | 3 Months Ended
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Mar. 31, 2017
Stockholders' Equity Note [Abstract] |
COMMON SHARES ISSUED AND OUTSTANDING | The following table presents our common shares issued and outstanding:
|  | Three months ended March 31, |
|  | 2017 |  | 2016 |
| Shares issued, balance at beginning of period | 176,580 |  |  | 176,240 |  |
| Shares issued | — |  |  | 316 |  |
| Total shares issued at end of period | 176,580 |  |  | 176,556 |  |
| Treasury shares, balance at beginning of period | (90,139 | ) |  | (80,174 | ) |
| Shares repurchased | (2,229 | ) |  | (3,910 | ) |
| Shares reissued from treasury | 958 |  |  | 431 |  |
| Total treasury shares at end of period | (91,410 | ) |  | (83,653 | ) |
| Total shares outstanding | 85,170 |  |  | 92,903 |  |
SHARE REPURCHASES | The following table presents our share repurchases:
|  | Three months ended March 31, |
|  | 2017 |  | 2016 |
| In the open market: |  |  |  |
| Total shares(1) | 1,896 |  |  | 3,704 |  |
| Total cost | $ | 127,982 |  |  | $ | 185,000 |  |
| Average price per share(2) | $ | 67.52 |  |  | $ | 49.94 |  |
| From employees:(3) |  |  |  |
| Total shares | 333 |  |  | 206 |  |
| Total cost | $ | 23,260 |  |  | $ | 11,011 |  |
| Average price per share(2) | $ | 69.80 |  |  | $ | 53.45 |  |
| Total shares repurchased: |  |  |  |
| Total shares | 2,229 |  |  | 3,910 |  |
| Total cost | $ | 151,242 |  |  | $ | 196,011 |  |
| Average price per share(2) | $ | 67.86 |  |  | $ | 50.13 |  |
(1) | The three months ended March 31, 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 vesting of restricted stock and restricted stock units, share repurchases from employees are excluded from the authorized share repurchase plans noted below.

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