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Stock Based Compensation - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2022
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Non-vested shares (in shares) | 616,752 | 550,536 | 524,570 |  |  | 526,074
Share-based compensation expense | $ 0.9 | $ 1.0 |  |  |  |
Unrecognized compensation cost | $ 5.8 | 6.8 |  |  |  |
Unrecognized compensation cost, period for recognition | 2 years 1 month 6 days |  |  |  |  |
Fair value of vested shares | $ 2.1 | $ 3.0 |  |  |  |
Requisite service period | 3 years |  |  |  |  |
Shares vested (in shares) | 246,917 | 244,015 |  |  |  |
Performance Share Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Fair value, expected term | 3 years |  |  |  |  |
RSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Non-vested shares (in shares) | 194,211 | 119,064 | 351,974 |  |  | 263,708
Shares vested (in shares) | 157,763 | 131,094 |  |  |  |
2017 Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum number of shares that may be issued (in shares) | 10,792,500 |  |  |  |  |
Shares available for grant (in shares) | 6,161,318 |  | 6,249,922 |  |  |
2017 Incentive Plan | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Non-vested shares (in shares) | 616,752 |  | 524,570 |  |  |
2017 Incentive Plan | Performance Share Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for grant (in shares) | 1,109,884 |  | 1,802,352 |  |  |
Share-based compensation expense | $ 0.8 | $ 1.1 |  |  |  |
Unrecognized compensation cost | $ 4.1 | 4.6 |  |  |  |
Unrecognized compensation cost, period for recognition | 1 year 6 months |  |  |  |  |
Fair value of vested shares | $ 3.6 | $ 2.0 |  |  |  |
Fair value, expected term for volatility rate | 3 years |  |  |  |  |
Award vesting period |  |  |  | 3 years | 3 years |
Shares vested (in shares) | 441,973 | 161,577 |  |  |  |
Vested shares target (in shares) | 350,886 | 201,978 |  |  |  |
2017 Incentive Plan | RSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for grant (in shares) | 194,211 |  | 351,974 |  |  |
Share-based compensation expense | $ 0.3 | $ 0.3 |  |  |  |
Unrecognized compensation cost | $ 1.8 | 1.5 |  |  |  |
Unrecognized compensation cost, period for recognition | 1 year 7 months 6 days |  |  |  |  |
Fair value of vested shares | $ 1.3 | $ 1.4 |  |  |  |
Requisite service period | 3 years |  |  |  |  |
Shares vested (in shares) | 157,763 | 131,094 |  |  |  |
2017 Incentive Plan | Share-Based Payment Arrangement, Employee | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued (in shares) |  |  | 1,204,781 |  |  |
2017 Incentive Plan | Director | Share-Based Payment Arrangement, Nonemployee |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued (in shares) | 301,472 |  | 301,472 |  |  |
2017 Incentive Plan | Employee | Share-Based Payment Arrangement, Employee |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued (in shares) | 1,543,880 |  |  |  |  |

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