Goodwill and Other Intangible Assets (Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 300,263
Accumulated impairment losses, beginning balance	(29,502)
Goodwill, beginning balance	270,761
Goodwill acquired	1,720
Goodwill, ending balance	301,983
Accumulated impairment losses, ending balance	(29,502)
Goodwill, ending balance	272,481
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	1,720
Goodwill, ending balance	135,795
Accumulated impairment losses, ending balance	(29,359)
Goodwill, ending balance	106,436
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