Restructuring (Schedule of Restructuring Liability) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restructuring Reserve [Roll Forward]
Restructuring expenses, net	$ 106,000	$ 1,331,000	$ 5,736,000
Ending balance	0
Employee Severance
Restructuring Reserve [Roll Forward]
Beginning balance	1,045,000	2,195,000
Restructuring expenses, net	106,000	1,331,000
Payments	(1,079,000)	(2,469,000)
Currency translation/other	(72,000)	(12,000)
Ending balance	$ 0	$ 1,045,000	$ 2,195,000