Restructuring - Narrative (Details) $ in Thousands		3 Months Ended				8 Months Ended	9 Months Ended
	Feb. 14, 2020 headcount	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring costs		$ 239			$ 0		$ 14,563	$ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Photonics and 3D Design
Restructuring Cost and Reserve [Line Items]
Restructuring noncash expense				$ 400
Proceeds from divestiture of businesses				700
Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Incurred cost				49,000
Restructuring costs						$ 14,213
Payments for restructuring						10,783
Professional fees and other related charges | Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected number of positions eliminated | headcount	500
Incurred cost		300	$ 600	13,700
Restructuring costs						2,580
Payments for restructuring						2,518
Professional fees and other related charges | Goodwill | Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs				21,200
Professional fees and other related charges | Excess and Obsolete Inventory | Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs				12,800
Professional fees and other related charges | Acquired Assets | Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs				10,500
Professional fees and other related charges | Capitalized Patents | Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs				1,400
Professional fees and other related charges | Other Assets | Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs				3,400
Professional fees and other related charges | Minimum | Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected cost		7,000				7,000	7,000
Restructuring and related cost, cash		9,000				9,000	9,000
Professional fees and other related charges | Maximum | Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected cost		17,000				17,000	17,000
Restructuring and related cost, cash		11,000				$ 11,000	$ 11,000
Employee Severance | Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Payments for restructuring		$ 2,900	$ 4,500	$ 900