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Restructuring Activities - (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Charges	$ 3,800	$ 3,400	$ 5,400	$ 2,200	$ 0	$ 14,671	$ 8,360
Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Beginning balance					4,001
Charges					0	14,800	$ 8,800
Cash Payments					(3,216)
Adoption of ASC 842 Adjustment					(735)
Change in Estimates					(50)
Ending balance	4,001				0	4,001
Restructuring Plan, 2017 \| Restructuring Charges
Restructuring Reserve [Roll Forward]
Beginning balance					3,951
Charges					0
Cash Payments					(3,216)
Adoption of ASC 842 Adjustment					(735)
Change in Estimates					0
Ending balance	3,951				0	3,951
Restructuring Plan, 2017 \| Cost of Sales
Restructuring Reserve [Roll Forward]
Beginning balance					50
Charges					0
Cash Payments					0
Adoption of ASC 842 Adjustment					0
Change in Estimates					(50)
Ending balance	50				0	50
Severance and benefits \| Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Beginning balance					2,631
Charges					0
Cash Payments					(2,631)
Adoption of ASC 842 Adjustment					0
Change in Estimates					0
Ending balance	2,631				0	2,631
Lease termination \| Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Beginning balance					861
Charges					0
Cash Payments					(126)
Adoption of ASC 842 Adjustment					(735)
Change in Estimates					0
Ending balance	861				0	861
Professional service fees \| Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Beginning balance					43
Charges					0
Cash Payments					(43)
Adoption of ASC 842 Adjustment					0
Change in Estimates					0
Ending balance	43				0	43
Other \| Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Beginning balance					416
Charges					0
Cash Payments					(416)
Adoption of ASC 842 Adjustment					0
Change in Estimates					0
Ending balance	416				0	416
Inventory reserve \| Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Beginning balance					50
Charges					0
Cash Payments					0
Adoption of ASC 842 Adjustment					0
Change in Estimates					(50)
Ending balance	$ 50				$ 0	$ 50