Goodwill and Other Intangible Assets (Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016
Goodwill [Roll Forward]
Goodwill, gross beginning balance	$ 332,917	$ 331,614
Accumulated impairment losses, beginning balance	(55,267)	(52,304)
Goodwill, net beginning balance	277,650	279,310
Goodwill acquired during the year	15,928	0
Impairment losses	(2,876)	(2,963)
Final purchase price allocations/contingent payments from prior year acquisitions		1,298
Foreign currency translation adjustment	3	5
Goodwill, gross ending balance	348,842	332,917
Accumulated impairment losses, ending balance	(58,143)	(55,267)
Goodwill, net ending balance	290,699	277,650
Office Furniture
Goodwill [Roll Forward]
Goodwill, gross beginning balance	149,718	149,713
Accumulated impairment losses, beginning balance	(55,124)	(52,161)
Goodwill, net beginning balance	94,594	97,552
Goodwill acquired during the year	15,928	0
Impairment losses	(2,876)	(2,963)
Final purchase price allocations/contingent payments from prior year acquisitions		0
Foreign currency translation adjustment	3	5
Goodwill, gross ending balance	165,643	149,718
Accumulated impairment losses, ending balance	(58,000)	(55,124)
Goodwill, net ending balance	107,643	94,594
Hearth Products
Goodwill [Roll Forward]
Goodwill, gross beginning balance	183,199	181,901
Accumulated impairment losses, beginning balance	(143)	(143)
Goodwill, net beginning balance	183,056	181,758
Goodwill acquired during the year	0	0
Impairment losses	0	0
Final purchase price allocations/contingent payments from prior year acquisitions		1,298
Foreign currency translation adjustment	0	0
Goodwill, gross ending balance	183,199	183,199
Accumulated impairment losses, ending balance	(143)	(143)
Goodwill, net ending balance	$ 183,056	$ 183,056