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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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 4.2 $ 6.8 $ 4.2
Share-based compensation expense, shares that vests on grant date $ 10.1 $ 8.8 17.0
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 4,417,693 4,125,067  
Exercise period 7 years    
Award vesting period 3 years    
Proceeds from stock options exercised $ 4.2 $ 6.8 4.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 1.0 4.1 2.8
Fair value of options vested during the period 1.9 2.3 2.6
Unrecognized compensation expense $ 3.4    
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 2.0 2.4
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense $ 5.6    
Weighted average years expense to be recognized over 1 year 9 months 18 days    
Share-based compensation expense, shares that vests on grant date $ 5.1 $ 4.7 $ 4.3
Shares outstanding 1,716,445 1,446,634  
Weighted average grant date fair value $ 8.74 $ 12.71 $ 12.65
Fair value of stock awards vested $ 3.6 $ 4.7 $ 5.5
PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense $ 4.0    
Weighted average years expense to be recognized over 2 years    
Share-based compensation expense, shares that vests on grant date $ 2.3 $ 2.1 $ 10.3
Shares outstanding 1,021,543 1,604,394  
Weighted average grant date fair value $ 8.35 $ 12.82 $ 12.75
Fair value of stock awards vested $ 8.1 $ 10.0 $ 9.3
Share-based Compensation, Equity Instruments Other than Options, Shares Called upon Vested 1    
Minimum | RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Minimum | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Percentage awarded 0.00%    
Maximum | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage awarded 150.00%    
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 $ 1.1 $ 1.1 $ 0.8