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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
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Mar. 31, 2021 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | $ 3,196 | $ 2,681
2014 Omnibus Incentive Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | 3,196 | 2,681
2014 Omnibus Incentive Plan | Common Stock Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | 1,120 | 982
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 | 102 | 33
2014 Omnibus Incentive Plan | Performance-Based Stock Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | 1,148 | 969
2014 Omnibus Incentive Plan | Liability Performance-Based Stock Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | 705 | 529
2014 Omnibus Incentive Plan | Performance-Based Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | $ 121 | $ 168

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