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Stockholders' Equity - Narrative Restricted Stock Awards and Stock Option Grants (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]      
Weighted average exercise price (in dollars per share) $ 19.27 $ 19.52  
Restricted Stock      
Class of Stock [Line Items]      
Options vested in period, fair value $ 3.3 $ 4.0 $ 3.6
Grants in period, weighted average grant date fair value (USD per share) $ 17.45 $ 15.25 $ 17.32
Compensation not yet recognized,share-based awards other than options $ 5.8 $ 5.7 $ 6.2
Compensation cost not yet recognized, period for recognition 2 years 5 months 15 days 2 years 4 months 20 days 2 years 6 months
Granted (in shares) 309    
Performance Restricted Stock Units      
Class of Stock [Line Items]      
Compensation not yet recognized,share-based awards other than options $ 0.9    
Compensation cost not yet recognized, period for recognition 1 year 10 months 13 days    
Granted (in shares) 49 45  
Stock issued during period, value, restricted stock award, gross $ 0.8 $ 0.7  
Employee Stock Option      
Class of Stock [Line Items]      
Compensation cost not yet recognized, period for recognition 2 years 3 months 25 days 1 year 8 months 26 days  
Weighted average exercise price (in dollars per share) $ 6.30 $ 5.81 $ 3.79
Compensation not yet recognized, stock options $ 3.4 $ 3.5