Commitments and Contingencies Sales Return Liability (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014
Sales return liability [Roll Forward]
Balance at beginning of year	$ 15,262	$ 9,433
Additions that reduce net sales	40,076	32,923
Deductions from reserves	(42,659)	(33,162)
Balance at end of period	$ 12,679	$ 9,194