Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Apr. 02, 2011
Sales return liability [Roll Forward]
Balance at beginning of year	$ 4,402	$ 2,944
Additions that reduce net sales	13,066	10,581
Deductions from reserves	(12,047)	(9,497)
Balance at end of period	5,421	4,028
Warranty on beds, description	20-year limited warranty
Customer participation term (in years)	18Y
Accrued warranty liabilities [Roll Forward]
Balance at beginning of year	6,310	5,744
Additions charged to costs and expenses for current-year sales	1,448	1,074
Deductions from reserves	(1,383)	(1,050)
Changes in liability for pre-existing warranties during the current year, including expirations	505	(142)
Balance at end of period	$ 6,880	$ 5,626