Goodwill and Other Intangible Assets (Goodwill) (Details) $ in Thousands	6 Months Ended
	Jul. 02, 2016 USD ($)
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	$ 332,917
Accumulated impairment losses, beginning balance	(55,267)
Goodwill, net, beginning balance	277,650
Goodwill acquired	15,365
Foreign currency translation adjustments	(6)
Goodwill, gross, ending balance	348,276
Accumulated impairment losses, ending balance	(55,267)
Goodwill, net, ending balance	293,009
Office Furniture [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	149,718
Accumulated impairment losses, beginning balance	(55,124)
Goodwill, net, beginning balance	94,594
Goodwill acquired	15,365
Foreign currency translation adjustments	(6)
Goodwill, gross, ending balance	165,077
Accumulated impairment losses, ending balance	(55,124)
Goodwill, net, ending balance	109,953
Hearth Products [Member]
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	183,199
Accumulated impairment losses, beginning balance	(143)
Goodwill, net, beginning balance	183,056
Goodwill acquired	0
Foreign currency translation adjustments	0
Goodwill, gross, ending balance	183,199
Accumulated impairment losses, ending balance	(143)
Goodwill, net, ending balance	$ 183,056