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EMPLOYEE COMPENSATION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2022
EMPLOYEE COMPENSATION PLANS [Abstract] |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] | The following table presents the total equity-based compensation expense (stock options and RSUs) for the years ended December 31, 2022, 2021 and 2020 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2022 | ​ | 2021 | ​ | 2020 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Equity-based compensation expense recognized in Cost of services | ​ | $ | 7,175 | ​ | $ | 6,099 | ​ | $ | 4,254 | ​
Equity-based compensation expense recognized in Selling, general and administrative | ​ | ​ | 10,396 | ​ | ​ | 10,326 | ​ | ​ | 8,253 | ​
Total equity-based compensation expense | ​ | $ | 17,571 | ​ | $ | 16,425 | ​ | $ | 12,507 | ​
​ | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​ | ​
Total tax benefit recognized | ​ | $ | 5,512 | ​ | $ | 8,673 | ​ | $ | 3,471 | ​
​
Summary of non-vested RSU's and performance-based RSU's | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted |
​ | ​ | ​ | ​ | Average |
​ | ​ | ​ | ​ | Grant Date |
​ | ​ | Shares | ​ | Fair Value |
​ | ​ | ​ | ​ | ​ | ​ | ​
Unvested as of December 31, 2021 |  | 885,612 | ​ | $ | 61.73 | ​
Granted |  | 1,120,176 | ​ | $ | 65.36 | ​
Vested |  | (320,593) | ​ | $ | 55.17 | ​
Cancellations/expirations |  | (326,472) | ​ | $ | 65.80 | ​
Unvested as of December 31, 2022 |  | 1,358,723 | ​ | $ | 65.37 | ​
​

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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