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Stock Options And Restricted Stock Awards (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option compensation expense $ 4.1 $ 2.5 $ 1.1
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option compensation expense 2.0 1.1 0.6
Unrecognized compensation cost $ 4.7    
Unrecognized compensation cost recognition period 2 years 2 months 12 days    
Intrinsic value on vested stock options $ 8.5    
Intrinsic value on outstanding stock options $ 17.7    
Share-based compensation number of shares vested 180,442    
Share-based compensation number of shares unvested 502,687    
Intrinsic value on exercised stock options $ 1.8 0.5 3.9
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option compensation expense 2.1 $ 1.4 $ 0.5
Unrecognized compensation cost $ 3.7    
Unrecognized compensation cost recognition period 1 year 9 months 18 days    
Fair market value of vested restricted stock awards $ 2.0    
2009 Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum shares of stock awards authorized for issuance 1,500,000    
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 shares available for grant 800,000    
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]      
Exercise price of stock options outstanding, lower range limit $ 4.62    
Exercise price of stock options outstanding, upper range limit $ 71.00    
2009 and 2017 Stock 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    
2009 and 2017 Stock 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    
2009 and 2017 Stock 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    
2009 and 2017 Stock 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    
2009 and 2017 Stock 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    
2009 and 2017 Stock 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