Business Segment Information (Details) $ in Thousands	3 Months Ended
	Apr. 01, 2017 USD ($) Segment	Apr. 02, 2016 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | Segment	2
Segment Reporting Information [Line Items]
Net sales	$ 477,667	$ 501,037
Operating profit	6,959	17,723
Depreciation and amortization	18,839	15,251
Capital expenditures (including capitalized software)	32,776	27,457
Identifiable assets	1,326,283		$ 1,330,234
Operating segments
Segment Reporting Information [Line Items]
Operating profit	18,255	33,861
Operating segments | Office Furniture
Segment Reporting Information [Line Items]
Net sales	359,981	387,339
Operating profit	6,444	21,300
Depreciation and amortization	12,885	10,693
Capital expenditures (including capitalized software)	21,020	16,468
Identifiable assets	752,115		749,145
Operating segments | Hearth Products
Segment Reporting Information [Line Items]
Net sales	117,686	113,698
Operating profit	11,811	12,561
Depreciation and amortization	3,488	2,656
Capital expenditures (including capitalized software)	2,078	2,553
Identifiable assets	340,544		340,494
General corporate
Segment Reporting Information [Line Items]
Operating profit	(11,296)	(16,138)
Depreciation and amortization	2,466	1,902
Capital expenditures (including capitalized software)	9,678	$ 8,436
Identifiable assets	$ 233,624		$ 240,595