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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of total shares granted, forfeited and delivered | Following is a summary of the total restricted shares granted, forfeited and delivered (vested) to participants with the related weighted average grant date fair value share prices. Of the shares that vested in the first six months of 2018, the Company withheld 23,824 shares to satisfy the tax obligations for those participants who elected this option as permitted under the applicable equity plan. As of the vesting dates, the aggregate fair value of shares that vested during the first six months of 2018 was $5,142,000.
| Three Months Ended |  | Six Months Ended
Award Activity: | June 30, 2018 |  | June 30, 2018
| Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value
Unvested at beginning of period | 123,287 |  |  | $ | 66.20 |  |  | 152,926 |  |  | $ | 63.22 |
Granted (1) (2) | 20,309 |  |  | 95.18 |  |  | 50,217 |  |  | 84.09 |
Forfeited | — |  |  | — |  |  | — |  |  | — |
Vested | — |  |  | — |  |  | (59,547 | ) |  | 63.77 |
Unvested at end of period | 143,596 |  |  | $ | 70.30 |  |  | 143,596 |  |  | $ | 70.30 |
(1) Includes shares granted in prior years for which performance conditions have been satisfied and the number of shares have been determined. (2) Does not include the restricted shares that may be earned if the performance goals established in 2017 for long-term performance and in 2018 for annual and long-term performance are achieved. Depending on the actual level of achievement of the goals at the end of the open performance periods, the number of shares earned could range from zero to 86,836.

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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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