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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2022
Stock-based payment awards |
Schedule of valuation assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
​ | ​ | 2022 | ​ | 2021 | ​ | 2020 | ​
Remaining performance period as of grant date (in years) |  | ​ | 2.9 |  | ​ | 2.8 |  | ​ | 2.9 |
Risk-free interest rate used |  | ​ | 1.4 | % | ​ | 0.3 | % | ​ | 1.4 | %
Grant-date fair value | ​ | $ | 11.96 | ​ | $ | 14.30 | ​ | $ | 11.33 | ​
​
Schedule stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2022 |  | 2021 |  | 2020
Equity award expense | ​ | $ | 11,928 | ​ | $ | 11,336 | ​ | $ | 10,551
Liability award expense (1) | ​ |  | 2,569 | ​ |  | (816) | ​ |  | 1,521
Total stock-based compensation expense | ​ | $ | 14,497 | ​ | $ | 10,520 | ​ | $ | 12,072
(1) | In 2021, we reversed a prior period expense of $2.1 million as the result of revised estimates of performance achievement of our 2020 and 2019 cash–settled performance–based restricted stock units.
Restricted stock and performance-based restricted stock units |
Stock-based payment awards |
Schedule of restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | ​ | ​ | Fair Value
​ |  | Shares |  | Per Share
Non-vested restricted stock and performance-based restricted stock units, December 31, 2021 |  | 2,055 | ​ | $ | 10.38
Granted |  | 1,599 | ​ |  | 8.97
Vested |  | (1,071) | ​ |  | 9.78
Canceled |  | (110) | ​ |  | 9.09
Non-vested restricted stock and performance-based restricted stock units, December 31, 2022 |  | 2,473 | ​ | $ | 9.79
Cash-settled performance units |
Stock-based payment awards |
Schedule of restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | ​ | ​ | Fair Value
​ |  | Shares |  | Per Share
Non-vested cash-settled performance units, December 31, 2021 |  | 523 | ​ | $ | 10.22
Granted |  | 262 | ​ |  | 9.38
Vested |  | (139) | ​ |  | 12.91
Canceled |  | (137) | ​ |  | 9.42
Non-vested cash-settled performance units, December 31, 2022 |  | 509 | ​ | $ | 9.27

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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 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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