Financial Instruments Measured at Fair Value - AFS (Details) - USD ($) $ in Thousands	Apr. 02, 2016	Dec. 31, 2015
Marubun [Member]
Schedule of Available-for-sale Securities [Line Items]
Available For Sale Investment Ownership Percentage	8.40%
Cost basis	$ 10,016	$ 10,016
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax	6,027	8,708
Fair value	16,043	18,724
Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost basis	17,423	17,389
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax	5,071	5,065
Fair value	$ 22,494	$ 22,454