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Equity Compensation Plans and Share-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options and Warrants, Additional Disclosures [Abstract]      
Exercise price (in dollars per share) $ 38    
Options and warrants outstanding, intrinsic value $ 0.3    
Options and warrants exercises in period, total intrinsic value $ 1.8 $ 0.6 $ 0.5
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]      
Shares issued in period 0    
Nonvested “restricted” stock      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]      
Total intrinsic value for nonvested common stock awards vested during period $ 9.4 $ 2.1 $ 1.6
Total intrinsic value for nonvested common stock awards outstanding $ 26.2    
Weighted-average period of recognition (years) 1 year 6 months    
Total compensation cost not yet recognized, nonvested common stock awards $ 13.5    
Time Based Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted (shares) 21,000 19,000 17,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]      
Vesting period 5 years 5 years 5 years
Stock Options and Warrants      
Share-based Compensation Arrangement by Share-based Payment Award, Options and Warrants, Additional Disclosures [Abstract]      
Exercise price (in dollars per share) $ 0 $ 39.00 $ 39.33
Stock Options and Warrants | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 10 years    
2020 Performance Based Awards | Minimum      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]      
Target share award earned, percentage 0.00%    
2020 Performance Based Awards | Maximum      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]      
Target share award earned, percentage 150.00%    
2019 And 2018 Performance Based Awards | Minimum      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]      
Target share award earned, percentage 0.00%    
2019 And 2018 Performance Based Awards | Maximum      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]      
Target share award earned, percentage 150.00%    
Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award, Options and Warrants, Additional Disclosures [Abstract]      
Unvested option to purchase shares (in shares) 10,000    
Prior to merger      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for grant 3,395,000