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SHAREHOLDERS' EQUITY (Tables) | 6 Months Ended
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Jun. 30, 2017
Stockholders' Equity Note [Abstract] |
COMMON SHARES ISSUED AND OUTSTANDING | The following table presents our common shares issued and outstanding:
|  | Three months ended June 30, |  | Six months ended June 30, |
|  | 2017 |  | 2016 |  | 2017 |  | 2016 |
| Shares issued, balance at beginning of period | 176,580 |  |  | 176,556 |  |  | 176,580 |  |  | 176,240 |  |
| Shares issued | — |  |  | 19 |  |  | — |  |  | 335 |  |
| Total shares issued at end of period | 176,580 |  |  | 176,575 |  |  | 176,580 |  |  | 176,575 |  |
| Treasury shares, balance at beginning of period | (91,410 | ) |  | (83,653 | ) |  | (90,139 | ) |  | (80,174 | ) |
| Shares repurchased | (2,004 | ) |  | (2,337 | ) |  | (4,233 | ) |  | (6,247 | ) |
| Shares reissued from treasury | 37 |  |  | 69 |  |  | 995 |  |  | 500 |  |
| Total treasury shares at end of period | (93,377 | ) |  | (85,921 | ) |  | (93,377 | ) |  | (85,921 | ) |
| Total shares outstanding | 83,203 |  |  | 90,654 |  |  | 83,203 |  |  | 90,654 |  |
SHARE REPURCHASES | The following table presents our share repurchases:
|  | Three months ended June 30, |  | Six months ended June 30, |
|  | 2017 |  | 2016 |  | 2017 |  | 2016 |
| In the open market: |  |  |  |  |  |  |  |
| Total shares(1) | 1,987 |  |  | 2,300 |  |  | 3,883 |  |  | 6,004 |  |
| Total cost | $ | 129,960 |  |  | $ | 125,000 |  |  | $ | 257,943 |  |  | $ | 310,000 |  |
| Average price per share(2) | $ | 65.40 |  |  | $ | 54.35 |  |  | $ | 66.44 |  |  | $ | 51.63 |  |
| From employees:(3) |  |  |  |  |  |  |  |
| Total shares | 17 |  |  | 37 |  |  | 350 |  |  | 243 |  |
| Total cost | $ | 1,110 |  |  | $ | 2,039 |  |  | $ | 24,370 |  |  | $ | 13,050 |  |
| Average price per share(2) | $ | 64.82 |  |  | $ | 54.70 |  |  | $ | 69.55 |  |  | $ | 53.65 |  |
| Total shares repurchased: |  |  |  |  |  |  |  |
| Total shares | 2,004 |  |  | 2,337 |  |  | 4,233 |  |  | 6,247 |  |
| Total cost | $ | 131,070 |  |  | $ | 127,039 |  |  | $ | 282,313 |  |  | $ | 323,050 |  |
| Average price per share(2) | $ | 65.40 |  |  | $ | 54.36 |  |  | $ | 66.69 |  |  | $ | 51.71 |  |
(1) | The six months ended June 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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