Goodwill and Other Intangible Assets - Future Amortization (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jan. 01, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Other intangible assets, net	$ 25,519
Patents and Purchased Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2016	10,219
2017	8,948
2018	6,317
2019	35
Other intangible assets, net	$ 25,519	$ 33,111