Intangible Assets (Details) - USD ($)	3 Months Ended			6 Months Ended		12 Months Ended
	Jul. 01, 2017	Apr. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization, intangible assets	$ 93,800,000			$ 93,800,000		$ 78,500,000
Impairment of intangible assets				0		$ 0
Amortization of acquired intangible assets	8,878,000		$ 8,498,000	17,565,000	$ 17,405,000
Research and development
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	141,000		187,000	314,000	373,000
Amortization of acquired intangible assets
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$ 8,737,000		$ 8,311,000	$ 17,251,000	$ 17,032,000
Patents
Finite-Lived Intangible Assets [Line Items]
Decrease of intangible assets, net of amortization		$ 3,500,000