Restructuring Costs (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 2,293	$ 289	$ 2,044
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring costs	1,200
Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 1,100