Derivatives (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Derivative [Line Items]
Net income	$ 2,663	$ 1,824
Forward Contracts [Member] | Commodity Contract [Member]
Derivative [Line Items]
Forward purchase amount	10,500
Cash Flow Hedging [Member]
Derivative [Line Items]
Cash flow hedge gain (loss) to be reclassified within 12 months	1,900
Net income	$ 0