Restructuring Activities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charge	$ 0	$ 119,000	$ 1,428,000
Restructuring Reserve [Roll Forward]
Restructuring liability, beginning balance	391,000	309,000	0
Amounts expensed	0	119,000	1,428,000
Amounts expensed - discontinued operations	0	581,000	0
Amounts paid	(326,000)	(618,000)	(1,119,000)
Restructuring liability, ending balance	$ 65,000	391,000	309,000
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charge		700,000
Restructuring Reserve [Roll Forward]
Amounts expensed			$ 1,428,000
Amounts expensed - discontinued operations		$ 581,000