Employee Benefits (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Maximum Contribution Percentage of Compensation	100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	4.00%
Defined Contribution Plan, Cost	$ 1.2	$ 1.5	$ 1.5
Foreign Subsidiary Contributions and Other Expenses	$ 0.8	$ 0.5	$ 0.5
Next Two Percent Of Participants Deferral Member [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	50.00%
Defined Contribution Plan, Percent of Employee Deferral Eligible for Employer Matching	2.00%
First Three Percent Of Participants Deferral Member [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	100.00%
Defined Contribution Plan, Percent of Employee Deferral Eligible for Employer Matching	3.00%