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Stock Options And Restricted Stock Awards (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]      
Stock option compensation expense $ 6.0 $ 5.8 $ 4.1
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options, Granted shares 0    
Stock option compensation expense $ 2.0 2.5 2.0
Unrecognized compensation cost $ 2.6    
Unrecognized compensation cost recognition period 1 year 6 months    
Intrinsic value on vested stock options $ 27.0    
Intrinsic value on outstanding stock options $ 12.5    
Share-based compensation number of shares vested 312,499    
Share-based compensation number of shares unvested 193,221    
Intrinsic value on exercised stock options $ 7.5 7.3 1.8
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option compensation expense 4.0 $ 3.3 $ 2.1
Unrecognized compensation cost $ 9.8    
Unrecognized compensation cost recognition period 1 year 8 months 12 days    
Fair market value of vested restricted stock awards $ 6.0    
2017 Omnibus Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum shares of stock awards authorized for issuance 1,182,270    
Share-based compensation number of common stock available for grant 614,888    
2017 Omnibus Incentive Plan [Member] | Stock options or stock appreciation rights "SARs" [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum shares of stock awards authorized for issuance 500,000    
2017 Omnibus Incentive Plan [Member] | Awards denominated in shares of common stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum shares of stock awards authorized for issuance 300,000    
2017 Omnibus Incentive Plan [Member] | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based payment award, expiration period 10 years    
Exercise prices of stock options outstanding, lower range limit $ 8.91    
Exercise prices of stock options outstanding, upper range limit $ 87.80    
2017 Omnibus Incentive Plan [Member] | Stock Options [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based payment vesting period 3 years    
2017 Omnibus Incentive Plan [Member] | Stock Options [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based payment vesting period 4 years    
2017 Omnibus Incentive Plan [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based payment award, expiration period 10 years    
2017 Omnibus Incentive Plan [Member] | Restricted Stock [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based payment vesting period 1 year    
2017 Omnibus Incentive Plan [Member] | Restricted Stock [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based payment vesting period 4 years