Restructuring (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 6,187	$ 7,986
Operational Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	1,000
Consolidation of Leased Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 5,100