Commitments and Contingencies Sales Return Liability (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015
Sales return liability [Roll Forward]
Balance at beginning of year	$ 20,562	$ 15,262
Additions that reduce net sales	35,419	40,076
Deductions from reserves	(40,226)	(42,659)
Balance at end of period	$ 15,755	$ 12,679