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Equity-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
May 04, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 0 0 0  
Market price of common stock, per share $ 71.94      
Unrecognized compensation cost $ 14.1      
Weighted average cost recognition period, in years 2 years 3 months 18 days      
Accrued equity based compensation $ 18.2 $ 28.0    
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Typical vesting period, in years 4 years      
Performance stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares awarded (in shares) 160,426      
Forfeited in period (in shares) 28,556      
Performance stock units outstanding (in shares) 407,289 329,257    
2018 Plan | Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized       1,000,000
2015 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for issuance under the Plan 513,000      
2015 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for issuance under the Plan 136,000      
Non-Employee Directors Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for issuance under the Plan 29,000      
Accrued Expenses, Current        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accrued equity based compensation $ 3.5      
Non Current Liabilities        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accrued equity based compensation $ 14.7 $ 13.2