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Goodwill and Other Intangible Assets (Goodwill) (Details) $ in Thousands	9 Months Ended
	Sep. 29, 2018 USD ($)
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	$ 311,856
Accumulated impairment losses, beginning balance	(32,351)
Goodwill, net, beginning balance	279,505
Goodwill acquired during the year	3,444
Foreign currency translation adjustments	(10)
Goodwill, gross, ending balance	315,290
Accumulated impairment losses, ending balance	(32,351)
Goodwill, net, ending balance	282,939
Office Furniture
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	128,657
Accumulated impairment losses, beginning balance	(32,208)
Goodwill, net, beginning balance	96,449
Goodwill acquired during the year	0
Foreign currency translation adjustments	(10)
Goodwill, gross, ending balance	128,647
Accumulated impairment losses, ending balance	(32,208)
Goodwill, net, ending balance	96,439
Hearth Products
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	183,199
Accumulated impairment losses, beginning balance	(143)
Goodwill, net, beginning balance	183,056
Goodwill acquired during the year	3,444
Foreign currency translation adjustments	0
Goodwill, gross, ending balance	186,643
Accumulated impairment losses, ending balance	(143)
Goodwill, net, ending balance	$ 186,500

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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