Restructuring - Restructuring Plan Activity (Details) - Restructuring Plan 2016 - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Reserve [Roll Forward]
Beginning balance		$ 900
Charge (credit) to income	$ 3,763		$ 13,505
Utilized - cash		578	10,719
Utilized - non-cash			508
Ending balance	2,278	322	2,278
Severance and benefit related costs
Restructuring Reserve [Roll Forward]
Beginning balance		645
Charge (credit) to income			6,793
Utilized - cash		437	4,786
Utilized - non-cash			0
Ending balance	2,007	208	2,007
Lease termination costs
Restructuring Reserve [Roll Forward]
Beginning balance		125
Charge (credit) to income			969
Utilized - cash		65	969
Utilized - non-cash			0
Ending balance	0	60	0
Relocation and other moving costs
Restructuring Reserve [Roll Forward]
Beginning balance		10
Charge (credit) to income			503
Utilized - cash		10	322
Utilized - non-cash			0
Ending balance	181	0	181
Other restructuring costs
Restructuring Reserve [Roll Forward]
Beginning balance		120
Charge (credit) to income			5,240
Utilized - cash		66	4,642
Utilized - non-cash			508
Ending balance	$ 90	$ 54	$ 90