Stock-Based And Long-Term Incentive Compensation (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($)
Stock Based and Long-Term Compensation (Textual) [Abstract]
Shares available for future grants | shares	328,000
Stock split, conversion ratio	0.10
Stock Options [Member]
Stock Based and Long-Term Compensation (Textual) [Abstract]
Share-based payment vesting period, years	3 years
Share-based payment expiration period, years	10 years
Cash received from exercising options	$ 0.0	$ 0.0	$ 0.1
Tax benefit from exercising stock options	0.0	$ 0.0	0.1
Unrecognized compensation expense related to non-vested options oustanding	2.0
Compensation expense expected to be recognizes in next year	1.4
Compensation expense expected to be recognized in 2 years	$ 0.6
Restricted Stock Units (RSUs) [Member]
Stock Based and Long-Term Compensation (Textual) [Abstract]
Share-based payment vesting period, years	3 years
Unrecognized compensation expense related to non-vested options oustanding	$ 13.1
Compensation expense expected to be recognizes in next year	9.4
Compensation expense expected to be recognized in 2 years	3.4
Compensation expense expected to be recognized in 3 years	$ 0.3
Shares outstanding | shares	413,966	342,243
Cash Restricted Stock Units [Member]
Stock Based and Long-Term Compensation (Textual) [Abstract]
Share-based payment vesting period, years	3 years
Shares outstanding | shares	174,424
Performance Share Units [Member]
Stock Based and Long-Term Compensation (Textual) [Abstract]
Shares outstanding | shares	315,213
Performance period of PSU grant, years	3 years
Portion of equivalent value in common stock of company after meeting service requirements, at discretion of compensation committee	50.00%
Performance Share Units Outstanding, in next year | shares	94,091
Performance Share Units Outstanding, in 2 years | shares	100,052
Performance Share Units Outstanding, in 3 years | shares	121,070
Supplemental Executive Retirement Plan [Member]
Stock Based and Long-Term Compensation (Textual) [Abstract]
Employers Contribution to be received by plan participants, Minimum	5.00%
Employers Contribution to be received by plan participants, Maximum	35.00%
Employers contribution	$ 1.1	$ 1.2	0.9
Distribution to select participants	$ 2.3	0.0	0.0
Other Pension Plan [Member]
Stock Based and Long-Term Compensation (Textual) [Abstract]
Maximum employee contribution to be matched by employer	4.00%
Maximum empoyee contribution	75.00%
Company contribution, percent	100.00%
Company discretionary contributions	$ 10.5	$ 10.0	$ 8.4
Non-Qualified Deferred Compensation Plans [Member]
Stock Based and Long-Term Compensation (Textual) [Abstract]
Maximum portion of base salary to defer under non-qualified deferred compensation plan	75.00%
Maximum portion of bonus to defer under non-qualified deferred compensation plan	100.00%
Non-employee cash deferred to non-qualified compensation plan	100.00%
Maximum of cash portion of PSU compensation to defer under non-qualified deferred compensation plan	100.00%
Maximum of cash portion of RSU compensation to defer under non-qualified deferred compensation plan	100.00%
Non-employee RSU deferred to non-qualified compensation plan	100.00%