Restructuring Costs (Restructuring Activities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Charges [Abstract]
Restructuring reserve, beginning balance	$ 159
Restructuring costs	2,293	$ 289	$ 2,044
Restructuring reserve, ending balance	604	159
Employee Severance
Restructuring Charges [Abstract]
Restructuring costs	1,200
Cost Reduction Program
Restructuring Charges [Abstract]
Restructuring costs	1,559
Cost Reduction Program | Employee Severance
Restructuring Charges [Abstract]
Restructuring reserve, beginning balance	159	254	1,333
Restructuring costs		289	2,044
Adjustment for adoption of ASU 2016-02	(69)
Cash payments	(1,064)	(384)	(3,122)
Foreign currency translation	19	0	(1)
Restructuring reserve, ending balance	$ 604	$ 159	$ 254