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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2019
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 three months ended March 31, 2019, the Company withheld 28,955 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 three months ended March 31, 2019, was $6,662,000.
| Three Months Ended |
Award Activity: | March 31, 2019 |
| Shares |  | Weighted Average Grant Date Fair Value |
Unvested at beginning of period | 143,525 |  |  | $ | 70.29 |  |
Granted (1) (2) | 49,768 |  |  | 91.03 |  |
Forfeited | (2,685 | ) |  | 83.05 |  |
Vested | (69,363 | ) |  | 66.99 |  |
Unvested at end of period | 121,245 |  |  | $ | 80.41 |  |
(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 and 2018 for long-term performance and in 2019 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 113,301.

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