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Stock-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 [Line Items]      
Number of shares authorized 11,775,000    
Capitalization of stock based compensation expense $ 0.0    
Proceeds from stock options exercised 4.4 $ 4.2 $ 6.8
Share-based compensation expense, shares that vests on grant date $ 6.5 $ 10.1 8.8
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 4,962,885 4,417,693  
Exercise period 10 years 7 years  
Award vesting period 3 years    
Proceeds from stock options exercised $ 4.4 $ 4.2 6.8
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 1.6 1.0 4.1
Fair value of options vested during the period 2.7 1.9 2.3
Unrecognized compensation expense $ 3.3    
Weighted average years expense to be recognized over 1 year 8 months 12 days    
Share-based compensation expense, shares that vests on grant date $ 2.7 2.7 2.0
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Unrecognized compensation expense $ 5.7    
Weighted average years expense to be recognized over 1 year 9 months 18 days    
Share-based compensation expense, shares that vests on grant date $ 5.2 $ 5.1 $ 4.7
Shares outstanding 2,050,085 1,716,445  
Weighted average grant date fair value $ 7.92 $ 8.74 $ 12.71
Fair value of stock awards vested $ 4.7 $ 3.6 $ 4.7
PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense 0.0    
Share-based compensation expense, shares that vests on grant date $ (1.4) $ 2.3 $ 2.1
Shares outstanding 0 1,021,543  
Weighted average grant date fair value $ 8.25 $ 8.35 $ 12.82
Fair value of stock awards vested $ 4.8 $ 8.1 $ 10.0
Share-based Compensation, Equity Instruments Other than Options, Shares Called upon Vested 1    
Minimum | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage awarded 0.00%    
Maximum | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Percentage awarded 200.00%    
Fully Vested On The Grant Date | RSUs | Non-employee directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense, shares that vests on grant date $ 0.9 $ 1.1 $ 1.1