Restructuring - Restructuring Reserve Roll Forward (Details) - USD ($) $ in Thousands	12 Months Ended			17 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Restructuring Reserve [Roll Forward]
Change to income	$ 6,894	$ 12,814	$ 9,168
Restructuring Plan 2017
Restructuring Reserve [Roll Forward]
Beginning balance	5,189
Change to income	29,486	23,743
Foreign Currency Translation	91
Utilized, Cash	14,800	8,474		$ 25,800
Utilized non-cash	17,372	10,080		113,900
Ending balance	2,412	5,189		2,412
Restructuring Plan 2016
Restructuring Reserve [Roll Forward]
Beginning balance	0	900
Change to income		0	16,100
Utilized, Cash		900	14,435
Utilized non-cash		0	765
Ending balance		0	900
Severance and benefit related costs | Restructuring Plan 2017
Restructuring Reserve [Roll Forward]
Beginning balance	3,864
Change to income	4,536	7,345
Foreign Currency Translation	69
Utilized, Cash	6,589	3,481
Utilized non-cash	0	0
Ending balance	1,742	3,864		1,742
Severance and benefit related costs | Restructuring Plan 2016
Restructuring Reserve [Roll Forward]
Beginning balance	0	645
Change to income		0	7,396
Utilized, Cash		645	6,751
Utilized non-cash		0	0
Ending balance		0	645
Lease termination costs | Restructuring Plan 2017
Restructuring Reserve [Roll Forward]
Beginning balance	650
Change to income	2,174	5,320
Foreign Currency Translation	19
Utilized, Cash	2,446	2,706
Utilized non-cash	0	1,964
Ending balance	359	650		359
Lease termination costs | Restructuring Plan 2016
Restructuring Reserve [Roll Forward]
Beginning balance	0	125
Change to income		0	1,137
Utilized, Cash		125	1,012
Utilized non-cash		0	0
Ending balance		0	125
Relocation and other moving costs | Restructuring Plan 2017
Restructuring Reserve [Roll Forward]
Beginning balance	0
Change to income	184	147
Foreign Currency Translation	0
Utilized, Cash	184	147
Utilized non-cash	0	0
Ending balance	0	0		0
Relocation and other moving costs | Restructuring Plan 2016
Restructuring Reserve [Roll Forward]
Beginning balance	0	10
Change to income		0	562
Utilized, Cash		10	552
Utilized non-cash		0	0
Ending balance		0	10
Other restructuring | Restructuring Plan 2017
Restructuring Reserve [Roll Forward]
Beginning balance	675
Change to income	22,592	10,931
Foreign Currency Translation	3
Utilized, Cash	5,581	2,140
Utilized non-cash	17,372	8,116
Ending balance	311	675		$ 311
Other restructuring | Restructuring Plan 2016
Restructuring Reserve [Roll Forward]
Beginning balance	$ 0	120
Change to income		0	7,005
Utilized, Cash		120	6,120
Utilized non-cash		0	765
Ending balance		$ 0	$ 120