Restructuring - Restructuring Plan Activity (Details) - Restructuring Plan 2016 - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Restructuring Reserve [Roll Forward]
Beginning balance	$ 900
Charge (Credit) to Income	0	$ 9,742
Utilized - Cash	300	6,671
Utilized - Non-Cash	0	0
Ending balance	600	3,071
Severance and benefit related costs
Restructuring Reserve [Roll Forward]
Beginning balance	645
Charge (Credit) to Income	0	5,641
Utilized - Cash	228	3,062
Utilized - Non-Cash	0	0
Ending balance	417	2,579
Lease termination costs
Restructuring Reserve [Roll Forward]
Beginning balance	125
Charge (Credit) to Income	0	969
Utilized - Cash	30	583
Utilized - Non-Cash	0	0
Ending balance	95	386
Relocation and other moving costs
Restructuring Reserve [Roll Forward]
Beginning balance	10
Charge (Credit) to Income	0	120
Utilized - Cash	10	120
Utilized - Non-Cash	0	0
Ending balance	0	0
Other restructuring costs
Restructuring Reserve [Roll Forward]
Beginning balance	120
Charge (Credit) to Income	0	3,012
Utilized - Cash	32	2,906
Utilized - Non-Cash	0	0
Ending balance	$ 88	$ 106