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Stockholders' Equity - Narrative - Restricted Stock Awards and Stock Option Grants (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Class of Stock [Line Items]      
Award vesting period 4 years    
Restricted Stock Awards      
Class of Stock [Line Items]      
Compensation not yet recognized, share-based awards other than options $ 9.0 $ 7.1  
Compensation cost not yet recognized, period for recognition 1 year 8 months 26 days 1 year 8 months 4 days  
Award vesting period 4 years    
Performance Restricted Stock Units      
Class of Stock [Line Items]      
Compensation not yet recognized, share-based awards other than options $ 1.1 $ 1.0  
Compensation cost not yet recognized, period for recognition 1 year 9 months 3 days 1 year 9 months  
Award vesting period 3 years    
Stock Option Awards      
Class of Stock [Line Items]      
Compensation cost not yet recognized, period for recognition 1 year 9 months 3 days 1 year 8 months 4 days  
Weighted average grant price (in dollars per share) $ 7.72 $ 6.30 $ 5.98
Total unrecognized compensation costs related to stock option awards $ 3.8 $ 2.8