Commitments and Contingencies Sales Return Liability (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2013		Sep. 29, 2012
Sales return liability [Roll Forward]
Balance at beginning of year	$ 5,330		$ 4,402
Additions that reduce net sales	33,260		33,082
Deductions from reserves	(28,816)		(32,231)
Acquired sales return reserve	98		0
Balance at end of period(1)	$ 9,872	[1]	$ 5,253

[1] The year-over-year increase in the sales returns liability is primarily due to an increase in our 30-night trial policy to 100 nights.