Goodwill and Other Intangible Assets (Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 29, 2012
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 300,263
Accumulated impairment losses, beginning balance	(29,502)
Goodwill, beginning balance	270,761
Goodwill acquired	22,598
Goodwill, ending balance	322,861
Accumulated impairment losses, ending balance	(29,502)
Goodwill, ending balance	293,359
Office Furniture [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	134,075
Accumulated impairment losses, beginning balance	(29,359)
Goodwill, beginning balance	104,716
Goodwill acquired	22,598
Goodwill, ending balance	156,673
Accumulated impairment losses, ending balance	(29,359)
Goodwill, ending balance	127,314
Hearth Products [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	166,188
Accumulated impairment losses, beginning balance	(143)
Goodwill, beginning balance	166,045
Goodwill acquired	0
Goodwill, ending balance	166,188
Accumulated impairment losses, ending balance	(143)
Goodwill, ending balance	$ 166,045