Goodwill and Intangible Assets Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets	$ 18,952	$ 18,952
Finite-Lived Intangible Assets, Accumulated Amortization	7,352	6,806
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets	18,851	18,851
Finite-Lived Intangible Assets, Accumulated Amortization	7,251	6,705
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets	101	101
Finite-Lived Intangible Assets, Accumulated Amortization	$ 101	$ 101