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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-based Payment Arrangement [Abstract] |
Schedule of grants of share-based awards | The following grants of share-based awards were made in 2022 under the 2005 Incentive Plan: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Grant Date | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Fair Value | ​ | ​
Date of Grant |  | Award Type |  | Shares/Units |  | Per Share/Unit |  | Vesting Period
January 1, 2022 (1) |  | RSU |  | 1,065,705 | ​ | $ | 3.12 |  | 33% per year over three years
January 4, 2022 (1) |  | PSU |  | 1,065,705 | ​ | $ | 4.25 |  | 100% on January 4, 2025
January 4, 2022 (2) |  | Restricted stock |  | 15,775 | ​ | $ | 3.12 |  | 100% on January 1, 2024
April 1, 2022 (2) |  | Restricted stock |  | 14,710 | ​ | $ | 4.78 |  | 100% on January 1, 2024
July 1, 2022 (2) |  | Restricted stock |  | 14,867 | ​ | $ | 3.10 |  | 100% on January 1, 2024
September 22, 2022 (3) |  | Restricted stock |  | 19,328 | ​ | $ | 4.38 |  | 100% on September 22, 2023
October 1, 2022 (2) |  | Restricted stock |  | 12,796 | ​ | $ | 3.86 |  | 100% on January 1, 2024
December 7, 2022 (2) |  | Restricted stock |  | 175,882 | ​ | $ | 5.97 |  | 100% on December 7, 2023
(1) | Reflects grants to our executive officers.
(2) | Reflects grants to certain independent members of our Board who have elected to take their quarterly fees in stock in lieu of cash, of which 8,013 shares granted on January 4, 2022 and 5,230 shares granted on April 1, 2022 vested upon the approval of our Board’s Compensation Committee in connection with the departure of an independent director during the second quarter 2022.
(3) | Reflects restricted stock grants made to two new independent members of our Board in connection with their appointment to our Board.
Summary of information about restricted stock | The following table summarizes information about our restricted stock: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2022 | ​ | 2021 | ​ | 2020
​ | ​ | ​ | ​ | Grant Date | ​ | ​ | ​ | Grant Date | ​ | ​ | ​ | Grant Date
​ |  | Shares |  | Fair Value (1) |  | Shares |  | Fair Value (1) |  | Shares |  | Fair Value (1)
Awards outstanding at beginning of year |  | 853,726 | ​ | $ | 5.62 |  | 1,176,951 | ​ | $ | 6.61 |  | 1,173,045 | ​ | $ | 6.81
Granted |  | 253,358 | ​ |  | 5.33 |  | 332,841 | ​ |  | 3.59 |  | 667,752 | ​ |  | 7.06
Vested (2) |  | (719,456) | ​ |  | 4.94 |  | (656,066) | ​ |  | 6.35 |  | (631,498) | ​ |  | 7.52
Forfeited |  | — | ​ |  | — |  | — | ​ |  | — |  | (32,348) | ​ |  | 5.41
Awards outstanding at end of year |  | 387,628 | ​ | $ | 6.70 |  | 853,726 | ​ | $ | 5.62 |  | 1,176,951 | ​ | $ | 6.61
(1) | Represents the weighted average grant date fair value, which is based on the quoted closing market price of our common stock on the trading day prior to the date of grant.
(2) | Total fair value of restricted stock that vested during the years ended December 31, 2022, 2021 and 2020 was $2.9 million, $2.6 million and $5.4 million, respectively.
Summary of information about PSU awards | The following table summarizes information about our PSU awards: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year Ended December 31,
​ | ​ | 2022 | ​ | 2021 | ​ | 2020
​ | ​ | ​ | ​ | Grant Date | ​ | ​ | ​ | Grant Date | ​ | ​ | ​ | Grant Date
​ |  | Units |  | Fair Value (1) |  | Units |  | Fair Value (1) |  | Units |  | Fair Value (1)
PSU awards outstanding at beginning of year |  | 1,381,469 | ​ | $ | 8.34 |  | 1,297,126 | ​ | $ | 9.99 |  | 1,565,044 | ​ | $ | 10.17
Granted |  | 1,065,705 | ​ |  | 4.25 |  | 452,381 | ​ |  | 5.33 |  | 369,938 | ​ |  | 13.15
Vested |  | (559,150) | ​ |  | 7.60 |  | (368,038) | ​ |  | 10.44 |  | (589,335) | ​ |  | 12.64
Forfeited |  | — | ​ |  | — |  | — | ​ |  | — |  | (48,521) | ​ |  | 7.60
PSU awards outstanding at end of year |  | 1,888,024 | ​ | $ | 6.25 |  | 1,381,469 | ​ | $ | 8.34 |  | 1,297,126 | ​ | $ | 9.99
(1) | Represents the weighted average grant date fair value.
Summary of information about RSU awards | The following table summarizes information about our RSU awards: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year Ended December 31,
​ | ​ | 2022 | ​ | 2021
​ | ​ | ​ | ​ | Grant Date | ​ | ​ | ​ | Grant Date
​ |  | Units |  | Fair Value (1) |  | Units |  | Fair Value (1)
RSU awards outstanding at beginning of year |  | 452,381 | ​ | $ | 4.20 |  | — | ​ | $ | —
Granted |  | 1,065,705 | ​ |  | 3.12 |  | 452,381 | ​ |  | 4.20
Vested |  | (150,792) | ​ |  | 4.20 |  | — | ​ |  | —
RSU awards outstanding at end of year |  | 1,367,294 | ​ | $ | 3.36 |  | 452,381 | ​ | $ | 4.20
(1) | Represents the weighted average grant date fair value, which is based on the quoted closing market price of our common stock on the trading day prior to the date of grant.

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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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