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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