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Reportable Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) Segment	Apr. 01, 2017 USD ($)	Dec. 30, 2017 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | Segment	2
Segment Reporting Information [Line Items]
Net sales	$ 505,069	$ 477,667
Income before income taxes	1,462	6,959
Depreciation and amortization	18,445	18,839
Capital expenditures (including capitalized software)	16,331	32,776
Identifiable assets	1,345,139		$ 1,391,550
Operating segments | Office Furniture
Segment Reporting Information [Line Items]
Net sales	380,915	359,981
Income before income taxes	(387)	6,444
Depreciation and amortization	10,986	12,885
Capital expenditures (including capitalized software)	11,577	21,020
Identifiable assets	787,106		821,767
Operating segments | Hearth Products
Segment Reporting Information [Line Items]
Net sales	124,154	117,686
Income before income taxes	17,114	11,811
Depreciation and amortization	1,962	3,488
Capital expenditures (including capitalized software)	2,938	2,078
Identifiable assets	344,653		347,189
General corporate
Segment Reporting Information [Line Items]
Income before income taxes	(15,265)	(11,296)
Depreciation and amortization	5,497	2,466
Capital expenditures (including capitalized software)	1,816	$ 9,678
Identifiable assets	$ 213,380		$ 222,594

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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