Restructuring (Restructuring Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 279	$ 178
Severance and other associated costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 279
Restructuring costs		$ 178