Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Business Acquisitions) (Details) - USD ($) $ in Thousands	1 Months Ended						3 Months Ended	9 Months Ended
	May 31, 2016	Feb. 29, 2016	Jan. 31, 2016	Aug. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Apr. 30, 2014
Business Acquisition [Line Items]
Cash consideration net of cash acquired								$ 34,237	$ 41,058
Goodwill								$ 93,925	$ 84,551	$ 83,619
Signature Seating
Business Acquisition [Line Items]
Cash consideration				$ 16,000
Contingent consideration				3,556
Total fair value of consideration given				19,556
Net other assets				4,023
Total fair value of net assets acquired				11,523
Goodwill				8,033
Spectal Industries
Business Acquisition [Line Items]
Cash consideration					$ 22,335
Contingent consideration					1,211
Total fair value of consideration given					$ 23,546
Net other assets											$ 4,381
Total fair value of net assets acquired											14,481
Goodwill											9,065
Project 2000
Business Acquisition [Line Items]
Cash consideration	$ 18,800
Cash consideration net of cash acquired	16,137
Contingent consideration	1,322
Total fair value of consideration given	17,459
Net other assets	2,533
Total fair value of net assets acquired	9,458
Goodwill	8,001
Highwater Marine Furniture
Business Acquisition [Line Items]
Cash consideration			$ 10,000
Net tangible assets			1,307
Total fair value of net assets acquired			9,407
Goodwill			593
Flair Interiors
Business Acquisition [Line Items]
Cash consideration		$ 8,100
Net other assets		2,378
Total fair value of net assets acquired		6,078
Goodwill		2,022
EA Technologies
Business Acquisition [Line Items]
Cash consideration						$ 9,248	$ 6,600
Net tangible assets						8,868
Total fair value of net assets acquired						9,348
Gain on bargain purchase						100
Customer Relationships | Signature Seating
Business Acquisition [Line Items]
Identifiable intangible assets				$ 7,500
Customer Relationships | Spectal Industries
Business Acquisition [Line Items]
Identifiable intangible assets											$ 10,100
Customer Relationships | Project 2000
Business Acquisition [Line Items]
Identifiable intangible assets	$ 6,925
Customer Relationships | Highwater Marine Furniture
Business Acquisition [Line Items]
Identifiable intangible assets			$ 8,100
Customer Relationships | Flair Interiors
Business Acquisition [Line Items]
Identifiable intangible assets		$ 3,700
Other Intangible Assets | EA Technologies
Business Acquisition [Line Items]
Identifiable intangible assets						$ 480