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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Restricted Stock and Units Activity | The following table summarizes the activity related to restricted stock unit (RSU) share based payment awards:
|  | Number of Shares |  |  | Weighted- Average Grant-Date Fair Value |
Unvested, January 1, 2020 |  |  | 98,810 |  |  | $ | 144.53 |
Granted |  |  | 143,179 |  |  |  | 162.32 |
Vested |  |  | (47,750 | ) |  |  | 136.59 |
Forfeited |  |  | (1,615 | ) |  |  | 122.83 |
Unvested, December 31, 2020 |  |  | 192,624 |  |  | $ | 160.99 |
The following table summarizes the activity related to restricted stock award (RSA) share based payment awards:
|  | Number of Shares |  |  | Weighted- Average Grant-Date Fair Value |
Unvested, January 1, 2020 |  |  | 311,643 |  |  | $ | 80.94 |
Granted |  |  | 1,926 |  |  |  | 155.85 |
Vested |  |  | (171,908 | ) |  |  | 50.65 |
Unvested, December 31, 2020 |  |  | 141,661 |  |  | $ | 124.81 |
Schedule of Nonvested Performance-Based Units Activity | The following table summarizes the activity related to performance unit awards (PSU) share based payment awards:
|  | Number of Shares |  |  | Weighted- Average Grant-Date Fair Value |
Unvested, January 1, 2020 |  |  | 37,781 |  |  | $ | 134.97 |
Granted |  |  | 111,410 |  |  |  | 167.74 |
Vested |  |  | (31,276 | ) |  |  | 105.65 |
Unvested, December 31, 2020 |  |  | 117,915 |  |  | $ | 165.48 |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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