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SHAREHOLDERS' EQUITY | 9 Months Ended
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Sep. 30, 2018
Stockholders' Equity Note [Abstract] |
SHAREHOLDERS' EQUITY | The following table presents common shares issued and outstanding:
|  | Three months ended September 30, |  | Nine months ended September 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
| Shares issued, balance at beginning of period | 176,580 |  |  | 176,580 |  |  | 176,580 |  |  | 176,580 |  |
| Shares issued | — |  |  | — |  |  | — |  |  | — |  |
| Total shares issued at end of period | 176,580 |  |  | 176,580 |  |  | 176,580 |  |  | 176,580 |  |
| Treasury shares, balance at beginning of period | (93,024 | ) |  | (93,377 | ) |  | (93,419 | ) |  | (90,139 | ) |
| Shares repurchased | — |  |  | (51 | ) |  | (175 | ) |  | (4,284 | ) |
| Shares reissued | 1 |  |  | 5 |  |  | 571 |  |  | 1,000 |  |
| Total treasury shares at end of period | (93,023 | ) |  | (93,423 | ) |  | (93,023 | ) |  | (93,423 | ) |
| Total shares outstanding | 83,557 |  |  | 83,157 |  |  | 83,557 |  |  | 83,157 |  |
Treasury Shares The following table presents share repurchases:
|  | Three months ended September 30, |  | Nine months ended September 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
| In the open market: |  |  |  |  |  |  |  |
| Total shares | — |  |  | 49 |  |  | — |  |  | 3,932 |  |
| Total cost | $ | — |  |  | $ | 3,237 |  |  | $ | — |  |  | $ | 261,180 |  |
| Average price per share(1) | $ | — |  |  | $ | 65.80 |  |  | $ | — |  |  | $ | 66.43 |  |
| From employees:(2) |  |  |  |  |  |  |  |
| Total shares | — |  |  | 2 |  |  | 175 |  |  | 352 |  |
| Total cost | $ | — |  |  | $ | 110 |  |  | $ | 8,699 |  |  | $ | 24,479 |  |
| Average price per share(1) | $ | — |  |  | $ | 64.04 |  |  | $ | 49.57 |  |  | $ | 69.53 |  |
| Total shares repurchased: |  |  |  |  |  |  |  |
| Total shares | — |  |  | 51 |  |  | 175 |  |  | 4,284 |  |
| Total cost | $ | — |  |  | $ | 3,347 |  |  | $ | 8,699 |  |  | $ | 285,659 |  |
| Average price per share(1) | $ | — |  |  | $ | 65.74 |  |  | $ | 49.57 |  |  | $ | 66.68 |  |
(1) Calculated using whole numbers.
(2) | Shares are repurchased from employees to satisfy withholding tax liabilities related to the vesting of restricted stock units.

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- References No definition available. + Details
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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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