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SHAREHOLDERS' EQUITY (Tables) | 3 Months Ended
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Mar. 31, 2018
Stockholders' Equity Note [Abstract] |
COMMON SHARES ISSUED AND OUTSTANDING | The following table presents common shares issued and outstanding:
|  | Three months ended March 31, |
|  | 2018 |  | 2017 |
| Shares issued, balance at beginning of period | 176,580 |  |  | 176,580 |  |
| Shares issued | — |  |  | — |  |
| Total shares issued at end of period | 176,580 |  |  | 176,580 |  |
| Treasury shares, balance at beginning of period | (93,419 | ) |  | (90,139 | ) |
| Shares repurchased | (149 | ) |  | (2,229 | ) |
| Shares reissued | 506 |  |  | 958 |  |
| Total treasury shares at end of period | (93,062 | ) |  | (91,410 | ) |
| Total shares outstanding | 83,518 |  |  | 85,170 |  |
SHARE REPURCHASES | The following table presents share repurchases:
|  | Three months ended March 31, |
|  | 2018 |  | 2017 |
| In the open market: |  |  |  |
| Total shares | — |  |  | 1,896 |  |
| Total cost | $ | — |  |  | $ | 127,982 |  |
| Average price per share(1) | $ | — |  |  | $ | 67.52 |  |
| From employees:(2) |  |  |  |
| Total shares | 149 |  |  | 333 |  |
| Total cost | $ | 7,163 |  |  | $ | 23,260 |  |
| Average price per share(1) | $ | 48.08 |  |  | $ | 69.80 |  |
| Total shares repurchased: |  |  |  |
| Total shares | 149 |  |  | 2,229 |  |
| Total cost | $ | 7,163 |  |  | $ | 151,242 |  |
| Average price per share(1) | $ | 48.08 |  |  | $ | 67.86 |  |
(1) Calculated using whole numbers.
(2) | Shares are repurchased from employees to satisfy withholding tax liabilities upon the vesting of restricted stock awards and restricted stock units.

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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 + Details
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