Commitments and Contingencies Sales Return Liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Sales return liability [Roll Forward]
Balance at beginning of year	$ 20,562	$ 15,262
Additions that reduce net sales	23,636	23,077
Deductions from reserves	(21,288)	(23,174)
Balance at end of period	$ 22,910	$ 15,165