Derivative Instruments - Foreign Currency Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2016	Jun. 28, 2015	Jul. 03, 2016	Jun. 28, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gain (Loss) Attributable To Foreign Exchange Rate Fluctuations, Inclusive Of The Impact Of Derivatives	$ (662)	$ (486)	$ (1,438)	$ (606)