Restructuring - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Severance Costs	$ 1,100
Restructuring Reserve	1,670	$ 1,857
2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1,300	$ 1,900
2019 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 400