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Stock Based Compensation - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock issued (in shares) |  |  | 30,900,000 | 15,890,000 |  |
Non-cash compensation expense |  |  | $ 2.2 | $ 1.3 | $ 1.8 |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares outstanding, unvested restricted stock (in shares) |  |  | 837,123 | 507,536 | 422,928 | 319,058
Forfeitures (in shares) |  |  | 1,575 | 5,120 | 0 |
Performance Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares outstanding, unvested restricted stock (in shares) |  |  | 2,018,518 | 842,792 | 0 |
Award vesting period |  |  | 3 years |  |  |
Fair value assumptions, expected term |  | 3 years |  |  |  |
2017 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Additional shares authorized (In shares) | 7,600,000 |  |  |  |  |
Maximum shares issuable (in shares) |  |  | 13,170,000 |  |  |
Common shares reserved for issuance (in shares) |  |  |  | 3,865,174 |  |
2017 Plan | Director |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock issued (in shares) |  |  | 228,750 | 131,975 |  |
2017 Plan | Employee |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock issued (in shares) |  |  | 827,126 |  |  |
2017 Plan | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares outstanding, unvested restricted stock (in shares) |  |  | 755,286 | 290,373 |  |
Stock issued (in shares) |  |  |  | 292,459 |  |
Unrecognized compensation expense |  |  | $ 3.1 | $ 1.9 |  |
Weighted average period to recognize the unrecognized compensation expense |  |  | 1 year 329 days |  |  |
Fair value of shares vested |  |  | $ 1.3 | $ 1.1 | $ 1.5 |
Requisite service period |  |  | 3 years |  |  |
2017 Plan | Performance Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common shares reserved for issuance (in shares) |  |  | 3,060,958 | 1,280,392 |  |
Non-cash compensation expense |  |  | $ 2.9 | $ 0.9 |  |
Unrecognized compensation expense |  |  | $ 4.5 | $ 2.6 |  |
Weighted average period to recognize the unrecognized compensation expense |  |  | 1 year 8 months 12 days |  |  |
Requisite service period |  |  | 3 years |  |  |
Award vesting period |  |  | 3 years |  |  |
Fair value assumptions, expected term |  |  | 3 years | 3 years |  |
2017 Plan | Performance Shares | Relative TSR performance Is Less than the 30th percentile |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights (as a percent) |  |  | 0.00% |  |  |
2017 Plan | Performance Shares | Relative TSR performance Is equal to the 50th percentile |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights (as a percent) |  |  | 100.00% |  |  |
2010 Stock Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common shares reserved for issuance (in shares) |  |  | 9,053,166 |  |  |
2010 Stock Incentive Plan | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares outstanding, unvested restricted stock (in shares) |  |  | 81,837 |  |  |
Unrecognized compensation expense |  |  | $ 3.1 | $ 1.9 |  |
Weighted average period to recognize the unrecognized compensation expense |  |  | 1 year 10 months 24 days |  |  |
Fair value of shares vested |  |  | $ 1.3 | $ 1.1 | $ 1.5 |
Requisite service period |  |  | 3 years |  |  |
Award vesting period |  |  | 3 years |  |  |

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