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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ 3,498 | $ 2,733 | $ 6,693 | $ 5,415
2014 Omnibus Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | 3,498 | 2,733 | 6,693 | 5,415
2014 Omnibus Incentive Plan | Common Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | 1,296 | 1,026 | 2,417 | 2,009
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 | 111 | 92 | 213 | 125
2014 Omnibus Incentive Plan | Performance-Based Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | 1,187 | 947 | 2,334 | 1,916
2014 Omnibus Incentive Plan | Liability Performance-Based Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | 680 | 538 | 1,385 | 1,067
2014 Omnibus Incentive Plan | Performance-Based Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ 224 | $ 130 | $ 344 | $ 298

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