Restructuring - (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 137	$ 160	$ 1,395
2014 Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	0	30
Cumulative restructuring charges	5,969
2015 Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	137	$ 160	$ 1,365
Cumulative restructuring charges	$ 2,681