Restructuring Activities (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Reserve [Roll Forward]
Restructuring liability, beginning balance	$ 188,000	$ 552,000	$ 391,000	$ 309,000
Amounts expensed	0	0	0	119,000
Amounts expensed - discontinued operations	0	0	0	396,000
Amounts paid	(93,000)	(309,000)	(296,000)	(581,000)
Restructuring liability, ending balance	$ 95,000	$ 243,000	$ 95,000	$ 243,000