General and Basis of Presentation - Restructuring Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 3,340	$ 3,463	$ 4,549	$ 3,463
Operating Segments | Europe & Africa
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	2,077	400	3,077	400
Operating Segments | North America
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	1,205	213	1,205	213
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 58	$ 2,850	$ 267	$ 2,850