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Stock Compensation Plans (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options outstanding (in shares) 0 0
RSUs | Ratably    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
RSUs | Cliff | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
RSUs | Cliff | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 5 years  
Performance-Based RSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total unrecognized compensation cost $ 22.0  
Weighted average period to recognize unrecognized compensation cost 2 years 4 months 16 days  
Performance-Based RSUs | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Potential for awards to vest (as a percent) 0.00%  
Performance-Based RSUs | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Potential for awards to vest (as a percent) 200.00%  
Performance-Based RSUs | Cliff    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
Time-Based RSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total unrecognized compensation cost $ 34.0  
Weighted average period to recognize unrecognized compensation cost 2 years 2 months 34 days