Restructuring Activities - Liability (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Restructuring liability, beginning balance				$ 65				$ 391	$ 65	$ 391	$ 309
Amounts expensed									625	0	119
Amounts expensed - discontinued operations									0	0	581
Amounts paid									(690)	(326)	(618)
Restructuring liability, ending balance	$ 0				$ 65				0	65	391
Net Income (Loss) Attributable to Parent	$ (4,340)	$ (1,278)	$ (945)	$ (1,289)	$ 896	$ 1,045	$ (1,753)	$ (216)	$ (7,852)	$ (28)	$ (10,449)