Restructuring (Credits) Charges - Restructuring Reserve (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Restructuring Charges	$ (100)	$ 342	$ (298)	$ 3,320
2015 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning balance			2,518	0	$ 0
Restructuring Charges					4,868
Cash payments			(1,619)		(2,505)
Write-offs					(317)
Other					472
Restructuring credits			(298)
Ending balance	601		601		2,518
2015 Restructuring Plan | Workforce Reduction Costs
Restructuring Reserve [Roll Forward]
Beginning balance			55	0	0
Restructuring Charges					1,885
Cash payments			(55)		(1,830)
Write-offs					0
Other					0
Restructuring credits			0
Ending balance	0		0		55
2015 Restructuring Plan | Lease Termination and Other Costs
Restructuring Reserve [Roll Forward]
Beginning balance			2,463	$ 0	0
Restructuring Charges					2,983
Cash payments			(1,564)		(675)
Write-offs					(317)
Other					472
Restructuring credits	(198)		(298)
Ending balance	$ 601		$ 601		$ 2,463