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Stock Based Compensation - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Non-vested shares (in shares) | 1,902,344 | 1,603,766 | 1,902,344 | 1,603,766 | 1,603,766 | 837,123
Forfeited (in shares) | 9,433 |  | 19,430 | 0 |  |
Unrecognized compensation cost | $ 7.2 | $ 7.9 | $ 7.2 | $ 7.9 |  |
Unrecognized compensation cost, period for recognition |  |  | 1 year 10 months 24 days |  |  |
Fair value of vested shares |  |  | $ 2.5 | $ 1.8 |  |
Shares vested (in shares) |  |  | 621,438 | 287,611 |  |
PSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Non-vested shares (in shares) | 3,690,883 | 2,902,014 | 3,690,883 | 2,902,014 | 2,902,014 | 2,018,518
Fair value of vested shares |  |  | $ 3.7 |  |  |
Fair value, expected term |  |  | 3 years |  |  |
Fair value, expected term for volatility rate |  |  | 3 years |  |  |
Shares vested (in shares) |  |  | 842,792 | 0 | 974,074 |
Vested shares target (in shares) | (842,792) |  | (842,792) |  |  |
RSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Non-vested shares (in shares) | 1,110,322 | 441,746 | 1,110,322 | 441,746 | 441,746 | 0
Fair value of vested shares |  |  | $ 0.5 |  |  |
Requisite service period |  |  | 3 years |  |  |
Shares vested (in shares) |  |  | 147,254 | 0 |  |
2017 Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum number of shares that may be issued (in shares) | 43,170,000 |  | 43,170,000 |  |  |
Shares available for grant (in shares) | 30,747,566 |  | 30,747,566 |  | 5,540,536 |
2017 Incentive Plan | Director |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued (in shares) |  |  | 661,013 |  | 507,821 |
2017 Incentive Plan | Employee |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued (in shares) |  |  | 2,801,396 |  |  |
2017 Incentive Plan | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Non-vested shares (in shares) | 1,902,344 |  | 1,902,344 |  | 1,603,766 |
Shares available for grant (in shares) |  |  |  |  | 4,798,517 |
Shares issued (in shares) |  |  |  |  | 1,881,380 |
Share-based compensation expense | $ 1.2 | $ 1.0 | $ 2.3 | $ 1.8 |  |
2017 Incentive Plan | PSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for grant (in shares) | 6,728,375 |  | 6,728,375 |  |  |
Share-based compensation expense | $ 1.7 | 1.2 | $ 3.1 | 2.5 |  |
Unrecognized compensation cost | $ 11.7 |  | $ 11.7 |  | $ 8.2 |
Unrecognized compensation cost, period for recognition |  |  | 2 years 1 month 6 days |  |  |
Award vesting period |  |  | 3 years |  |  |
Number of consecutive trading days for Total Shareholder Return (TSR) calculation |  |  | 30 days |  |  |
2017 Incentive Plan | PSUs | Relative TSR Performance is Less Than the 30th Percentile |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  |  | 0.00% |  |  |
2017 Incentive Plan | PSUs | Relative TSR Performance is Equal to the 50th Percentile |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  |  | 100.00% |  |  |
2017 Incentive Plan | RSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for grant (in shares) | 1,110,322 |  | 1,110,322 |  | 441,746 |
Share-based compensation expense | $ 0.5 | 0.2 | $ 0.9 | 0.5 |  |
Unrecognized compensation cost | $ 4.0 | $ 2.3 | $ 4.0 | $ 2.3 |  |
Unrecognized compensation cost, period for recognition |  |  | 2 years 2 months 12 days |  |  |
2010 Stock Incentive Plan | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Non-vested shares (in shares) | 0 |  | 0 |  |  |

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