Stock Options And Restricted Stock Awards (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option compensation expense	$ 9.4	$ 6.0	$ 5.8
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Granted shares	23,000	0
Stock option compensation expense	$ 1.4	$ 2.0	2.5
Unrecognized compensation cost	$ 1.9
Unrecognized compensation cost recognition period	1 year 6 months
Intrinsic value on vested stock options	$ 22.7
Intrinsic value on outstanding stock options	$ 2.8
Share-based compensation number of shares vested	386,428
Share-based compensation number of shares unvested	106,500
Intrinsic value on exercised stock options	$ 1.8	7.5	7.3
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option compensation expense	8.0	$ 4.0	$ 3.3
Unrecognized compensation cost	$ 11.4
Unrecognized compensation cost recognition period	1 year 8 months 12 days
Fair market value of vested restricted stock awards	$ 7.4
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	513,164
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	$ 90.87
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