Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2017	Jul. 03, 2016	Jul. 02, 2017	Jul. 03, 2016	Jan. 01, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 4,400	$ 3,200	$ 7,500	$ 11,500
Other intangible assets, accumulated amortization	(26,073)		(26,073)		$ 18,568
Intangible Assets, Net (Excluding Goodwill)	36,713		36,713		44,218
Other intangible assets, net	36,713		36,713
Intangible Assets, Gross (Excluding Goodwill)	62,786		62,786		62,786
Patents and Purchased Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	51,140		51,140		51,140
Other intangible assets, accumulated amortization	(21,150)		(21,150)		(16,014)
Other intangible assets, net	29,990		29,990		35,126
Project Pipeline Asset [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	9,446		9,446		9,446
Other intangible assets, accumulated amortization	(2,723)		(2,723)		(1,804)
Other intangible assets, net	6,723		6,723		7,642
In Process Research and Development [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	1,200		1,200		1,200
Other intangible assets, accumulated amortization	(1,200)		(1,200)		0
Other intangible assets, net	0		0		1,200
Other Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	1,000		1,000		1,000
Other intangible assets, accumulated amortization	(1,000)		(1,000)		(750)
Other intangible assets, net	$ 0		$ 0		$ 250