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Reportable Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jul. 01, 2017 USD ($)	Jun. 30, 2018 USD ($) Segment	Jul. 01, 2017 USD ($)	Dec. 30, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			2
Net sales	$ 543,614	$ 514,485	$ 1,048,683	$ 992,152
Operating income	27,060	21,649	30,746	29,583
Interest income (expense)	(2,629)	(1,022)	(4,853)	(1,997)
Income before income taxes	24,431	20,627	25,893	27,586
Depreciation and amortization	18,835	17,625	37,280	36,464
Capital expenditures (including capitalized software)	15,993	31,312	32,324	64,088
Identifiable assets	1,388,388		1,388,388		$ 1,391,550
Operating segments | Office Furniture
Segment Reporting Information [Line Items]
Net sales	423,878	406,444	804,793	766,425
Operating income	20,519	19,683	20,132	26,127
Depreciation and amortization	11,204	12,498	22,190	25,383
Capital expenditures (including capitalized software)	13,420	16,345	24,997	37,365
Identifiable assets	822,130		822,130		821,767
Operating segments | Hearth Products
Segment Reporting Information [Line Items]
Net sales	119,736	108,041	243,890	225,727
Operating income	16,312	12,104	33,426	23,915
Depreciation and amortization	2,092	2,706	4,054	6,194
Capital expenditures (including capitalized software)	1,229	5,134	4,167	7,212
Identifiable assets	352,625		352,625		347,189
General corporate
Segment Reporting Information [Line Items]
Operating income	(9,771)	(10,138)	(22,812)	(20,459)
Depreciation and amortization	5,539	2,421	11,036	4,887
Capital expenditures (including capitalized software)	1,344	$ 9,833	3,160	$ 19,511
Identifiable assets	$ 213,633		$ 213,633		$ 222,594

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