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Equity-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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 $ 66.68      
Unrecognized compensation cost $ 10.3      
Weighted average cost recognition period, in years 2 years 1 month 6 days      
Accrued equity based compensation $ 22.6 $ 18.2    
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) 62,778      
Forfeited in period (in shares) 7,167      
Performance stock units outstanding (in shares) 363,474 407,289    
Performance Shares, Market Condition        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares awarded (in shares) 0   0  
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares awarded (in shares) 72,243      
Forfeited in period (in shares) 22,073      
Performance stock units outstanding (in shares) 204,584 237,442    
Stock price average period 200 days      
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 393,000      
2015 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for issuance under the Plan 120,000      
Non-Employee Directors Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for issuance under the Plan 19,000      
Accrued Expenses, Current        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accrued equity based compensation $ 2.9      
Non Current Liabilities        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accrued equity based compensation $ 19.7 $ 14.7