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Employee Benefits - Summary of Share-Based Compensation Expense Under the 2014 Omnibus Incentive Plan (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ 3,535 | $ 2,635 | $ 10,228 | $ 8,050
2014 Omnibus Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | 3,535 | 2,635 | 10,228 | 8,050
2014 Omnibus Incentive Plan | Common Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | 1,426 | 997 | 3,843 | 3,006
2014 Omnibus Incentive Plan | Common Stock Awards | Non-Employee Common Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | 126 | 104 | 339 | 230
2014 Omnibus Incentive Plan | Performance-Based Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | 1,128 | 928 | 3,462 | 2,844
2014 Omnibus Incentive Plan | Liability Performance-Based Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | 598 | 488 | 1,983 | 1,554
2014 Omnibus Incentive Plan | Performance-Based Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ 257 | $ 118 | $ 601 | $ 416

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