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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of grants of share-based awards | During the nine-month period ended September 30, 2021, the following grants of share-based awards were made under the 2005 Incentive Plan: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Grant Date | ​ | ​
​ | ​ | ​ | ​ | Fair Value | ​ | ​
Date of Grant |  | Shares/Units |  | Per Share/Unit |  | Vesting Period
January 1, 2021 (1) |  | 452,381 | ​ | $ | 4.20 |  | 33% per year over three years
January 4, 2021 (2) |  | 452,381 | ​ | $ | 5.33 |  | 100% on January 4, 2024
January 4, 2021 (3) |  | 14,249 | ​ | $ | 4.20 |  | 100% on January 1, 2023
April 1, 2021 (3) |  | 9,282 | ​ | $ | 5.05 |  | 100% on January 1, 2023
July 1, 2021 (3) |  | 8,403 | ​ | $ | 5.71 |  | 100% on January 1, 2023
July 23, 2021 (4) |  | 14,664 | ​ | $ | 4.54 |  | 100% on July 23, 2022
(1) | Reflects grants of restricted stock units (“RSUs”) to our executive officers.
(2) | Reflects grants of performance share units (“PSUs”) to our executive officers. These PSUs consist of two components: (i) 50% based on the performance of our common stock and (ii) 50% based on cumulative total Free Cash Flow. The grant date fair value represents the average grant date fair value of the two components.
(3) | Reflects grants of restricted stock to certain independent members of our Board of Directors (our “Board”) who have elected to take their quarterly fees in stock in lieu of cash.
(4) | Reflects a grant of restricted stock made to a new independent member of our Board upon his joining our Board.

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- Definition Disclosure of share-based awards granted to executives, non-executive employees and independent members of our Board. + References No definition available. + Details
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