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Stock Based Compensation - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Non-vested shares (in shares) |  | 1,603,766 | 837,123 | 1,603,766 | 837,123 | 837,123 | 507,536
Forfeited (in shares) |  | 0 | 1,575 | 0 | 1,575 |  |
Unrecognized compensation cost |  | $ 6.9 | $ 3.6 | $ 6.9 | $ 3.6 |  |
Unrecognized compensation cost, period for recognition |  |  |  | 2 years 1 month 6 days |  |  |
Fair value of vested shares |  |  |  | $ 1.8 | $ 1.3 |  |
Performance Share Awards |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Non-vested shares (in shares) |  | 2,902,014 | 2,018,518 | 2,902,014 | 2,018,518 | 2,018,518 | 842,792
Fair value, expected term |  |  |  | 3 years |  |  |
Fair value, expected term for volatility rate |  |  |  | 3 years |  |  |
RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Non-vested shares (in shares) |  | 441,746 |  | 441,746 |  | 0 |
Requisite service period |  |  |  | 3 years |  |  |
2010 Stock Incentive Plan | Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Non-vested shares (in shares) |  | 0 |  | 0 |  |  |
2017 Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Increase the shares reserved (in shares) | 7,600,000 |  |  |  |  |  |
Maximum number of shares that may be issued (in shares) |  | 13,170,000 |  | 13,170,000 |  |  |
Shares available for grant (in shares) |  | 5,540,536 |  | 5,540,536 |  | 9,053,166 |
2017 Incentive Plan | Director |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  | 507,821 |  | 228,750 |
2017 Incentive Plan | Employee |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  | 1,881,380 |  |  |
2017 Incentive Plan | Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Non-vested shares (in shares) |  | 1,603,766 |  | 1,603,766 |  | 755,286 |
Shares available for grant (in shares) |  |  |  |  |  | 3,060,958 |
Shares issued (in shares) |  |  |  |  |  | 827,126 |
Share-based compensation expense |  | $ 1.0 | $ 0.6 | $ 2.8 | $ 1.7 |  |
2017 Incentive Plan | Performance Share Awards |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available for grant (in shares) |  | 4,798,517 |  | 4,798,517 |  |  |
Share-based compensation expense |  | $ 1.3 | $ 0.7 | $ 3.7 | $ 2.1 |  |
Unrecognized compensation cost |  | $ 7.0 |  | $ 7.0 |  | $ 5.2 |
Unrecognized compensation cost, period for recognition |  | 1 year 10 months 24 days |  |  |  |  |
Award vesting period |  |  |  | 3 years |  |  |
2017 Incentive Plan | Performance Share Awards | Relative TSR performance Is Less Than The Thirtieth Percentile |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting rights, percentage |  |  |  | 0.00% |  |  |
2017 Incentive Plan | Performance Share Awards | Relative TSR Performance Is Equal To The Fiftieth 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) |  | 441,746 |  | 441,746 |  |  |
Share-based compensation expense |  | $ 0.2 |  | $ 0.7 |  |  |
Unrecognized compensation cost |  | $ 2.1 |  | $ 2.1 |  |  |
Unrecognized compensation cost, period for recognition |  | 2 years 3 months 18 days |  |  |  |  |

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