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SHAREHOLDERS' EQUITY (TABLES) | 6 Months Ended
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Jun. 30, 2015
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, |
|  | 2015 |  | 2014 |  | 2015 |  | 2014 |
| Shares issued, balance at beginning of period | 176,190 |  |  | 175,195 |  |  | 175,478 |  |  | 174,134 |  |
| Shares issued | 16 |  |  | 120 |  |  | 728 |  |  | 1,181 |  |
| Total shares issued at end of period | 176,206 |  |  | 175,315 |  |  | 176,206 |  |  | 175,315 |  |
| Treasury shares, balance at beginning of period | (75,971 | ) |  | (68,450 | ) |  | (76,052 | ) |  | (64,649 | ) |
| Shares repurchased | (60 | ) |  | (3,058 | ) |  | (350 | ) |  | (7,094 | ) |
| Shares reissued from treasury | 109 |  |  | 99 |  |  | 480 |  |  | 334 |  |
| Total treasury shares at end of period | (75,922 | ) |  | (71,409 | ) |  | (75,922 | ) |  | (71,409 | ) |
| Total shares outstanding | 100,284 |  |  | 103,906 |  |  | 100,284 |  |  | 103,906 |  |
SHARE REPURCHASES | The following table presents our share repurchases:
|  | Three months ended June 30, |  | Six months ended June 30, |
|  | 2015 |  | 2014 |  | 2015 |  | 2014 |
| In the open market: |  |  |  |  |  |  |  |
| Total shares | — |  |  | 2,970 |  |  | 16 |  |  | 6,680 |  |
| Total cost | $ | — |  |  | $ | 135,395 |  |  | $ | 832 |  |  | $ | 300,000 |  |
| Average price per share(1) | $ | — |  |  | $ | 45.59 |  |  | $ | 50.69 |  |  | $ | 44.91 |  |
| From employees: |  |  |  |  |  |  |  |
| Total shares | 60 |  |  | 88 |  |  | 334 |  |  | 414 |  |
| Total cost | $ | 3,158 |  |  | $ | 3,985 |  |  | $ | 17,097 |  |  | $ | 18,082 |  |
| Average price per share(1) | $ | 52.51 |  |  | $ | 45.57 |  |  | $ | 51.17 |  |  | $ | 43.66 |  |
| Total shares repurchased: |  |  |  |  |  |  |  |
| Total shares | 60 |  |  | 3,058 |  |  | 350 |  |  | 7,094 |  |
| Total cost | $ | 3,158 |  |  | $ | 139,380 |  |  | $ | 17,929 |  |  | $ | 318,082 |  |
| Average price per share(1) | $ | 52.51 |  |  | $ | 45.59 |  |  | $ | 51.22 |  |  | $ | 44.84 |  |
(1) | Calculated using whole figures.

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