Restructuring Activities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restructuring Reserve [Roll Forward]
Restructuring liability, beginning balance	$ 552	$ 0	$ 309	$ 0
Amounts expensed	0	1,108	119	1,425
Amounts expensed - discontinued operations	0	0	396	0
Amounts paid	(309)	(616)	(581)	(933)
Restructuring liability, ending balance	$ 243	$ 492	$ 243	$ 492