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EMPLOYEE COMPENSATION PLANS (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
EMPLOYEE COMPENSATION PLANS [Abstract] |
Summary of non-vested RSU's and performance-based RSU's | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted |
​ | ​ | ​ | ​ | Average |
​ | ​ | ​ | ​ | Grant Date |
​ | ​ | Shares | ​ | Fair Value |
​ | ​ | ​ | ​ | ​ | ​ | ​
Unvested as of December 31, 2020 |  | 1,029,176 | ​ | $ | 41.12 | ​
Granted |  | 325,078 | ​ | $ | 96.47 | ​
Vested |  | (367,597) | ​ | $ | 38.57 | ​
Cancellations/expirations |  | (101,045) | ​ | $ | 47.87 | ​
Unvested as of December 31, 2021 |  | 885,612 | ​ | $ | 61.73 | ​

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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