Goodwill and Other Intangible Assets (Goodwill) (Details) $ in Thousands	6 Months Ended
	Jul. 01, 2017 USD ($)
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	$ 348,842
Accumulated impairment losses, beginning balance	(58,143)
Goodwill, net, beginning balance	290,699
Foreign currency translation adjustments	(39)
Goodwill, gross, ending balance	348,803
Accumulated impairment losses, ending balance	(58,143)
Goodwill, net, ending balance	290,660
Office Furniture
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	165,643
Accumulated impairment losses, beginning balance	(58,000)
Goodwill, net, beginning balance	107,643
Foreign currency translation adjustments	(39)
Goodwill, gross, ending balance	165,604
Accumulated impairment losses, ending balance	(58,000)
Goodwill, net, ending balance	107,604
Hearth Products
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	183,199
Accumulated impairment losses, beginning balance	(143)
Goodwill, net, beginning balance	183,056
Foreign currency translation adjustments	0
Goodwill, gross, ending balance	183,199
Accumulated impairment losses, ending balance	(143)
Goodwill, net, ending balance	$ 183,056