Acquisitions, Goodwill And Other Intangible Assets (Schedule of Business Acquisitions) (Details) - USD ($) $ in Thousands	1 Months Ended											12 Months Ended
	Nov. 30, 2016	May 31, 2016	Feb. 29, 2016	Jan. 31, 2016	Aug. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Aug. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Feb. 28, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jun. 13, 2014	Apr. 30, 2014	Feb. 27, 2014
Business Acquisition
Cash consideration net of cash acquired												$ 48,725	$ 41,058	$ 106,782
Goodwill (tax deductible)												$ 89,198	83,619
Flair Interiors
Business Acquisition
Cash consideration			$ 8,100
Net other assets			2,378
Total fair value of net assets acquired			6,078
Goodwill (tax deductible)			2,022
Highwater
Business Acquisition
Cash consideration				$ 10,000
Net tangible assets				1,307
Total fair value of net assets acquired				9,407
Goodwill (tax deductible)				593
Atwood Mobile Products, LLC
Business Acquisition
Cash consideration	$ 12,463
Total fair value of consideration given	12,500
Net other assets	10,347
Total fair value of net assets acquired	12,463
Project 2000
Business Acquisition
Cash consideration net of cash acquired		$ 16,137
Cash consideration		18,800
Contingent consideration		1,322
Total fair value of consideration given		17,459
Net other assets		128
Total fair value of net assets acquired		15,015
Goodwill (tax deductible)		2,444
Signature Seating
Business Acquisition
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 (tax deductible)					8,033
Spectal Industries, Inc.
Business Acquisition
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 (tax deductible)																9,065
EA Technologies, LLC
Business Acquisition
Cash consideration							$ 9,248						$ 6,600
Total fair value of consideration given							9,200
Net tangible assets							8,868
Total fair value of net assets acquired							9,348
Gain on bargain purchase							100
Duncan Systems, Inc.
Business Acquisition
Cash consideration								$ 18,000
Contingent consideration								1,914
Total fair value of consideration given								19,914
Net other assets								5,000
Total fair value of net assets acquired								15,500
Goodwill (tax deductible)								4,414
PowerGear and Kwikee Brands
Business Acquisition
Cash consideration									$ 35,500
Total fair value of consideration given									$ 35,500
Net tangible assets															$ 2,227
Total fair value of net assets acquired															21,957
Goodwill (tax deductible)															13,543
Star Designs, LLC
Business Acquisition
Cash consideration										$ 12,232
Total fair value of consideration given										12,200
Net other assets										2,718
Total fair value of net assets acquired										7,118
Goodwill (tax deductible)										5,114
Innovative Design Solutions, Inc
Business Acquisition
Cash consideration											$ 34,175
Present value of future payments											1,739
Contingent consideration											710
Total fair value of consideration given											$ 36,624
Net tangible assets																	$ 1,894
Total fair value of net assets acquired																	15,074
Goodwill (tax deductible)																	21,550
Customer Relationships | Flair Interiors
Business Acquisition
Identifiable intangible assets			$ 3,700
Customer Relationships | Highwater
Business Acquisition
Identifiable intangible assets				$ 8,100
Customer Relationships | Atwood Mobile Products, LLC
Business Acquisition
Identifiable intangible assets	$ 2,116
Customer Relationships | Project 2000
Business Acquisition
Identifiable intangible assets		9,694
Customer Relationships | Signature Seating
Business Acquisition
Identifiable intangible assets					$ 7,500
Customer Relationships | Spectal Industries, Inc.
Business Acquisition
Identifiable intangible assets																$ 10,100
Customer Relationships | Duncan Systems, Inc.
Business Acquisition
Identifiable intangible assets								$ 10,500
Customer Relationships | PowerGear and Kwikee Brands
Business Acquisition
Identifiable intangible assets															12,300
Customer Relationships | Star Designs, LLC
Business Acquisition
Identifiable intangible assets										$ 4,400
Customer Relationships | Innovative Design Solutions, Inc
Business Acquisition
Identifiable intangible assets																	4,000
Patents | PowerGear and Kwikee Brands
Business Acquisition
Identifiable intangible assets															5,300
Patents | Innovative Design Solutions, Inc
Business Acquisition
Identifiable intangible assets																	6,000
Other Identifiable Intangible Assets | Project 2000
Business Acquisition
Identifiable intangible assets		$ 5,193
Other Identifiable Intangible Assets | EA Technologies, LLC
Business Acquisition
Identifiable intangible assets							$ 480
Other Identifiable Intangible Assets | PowerGear and Kwikee Brands
Business Acquisition
Identifiable intangible assets															$ 2,130
Other Identifiable Intangible Assets | Innovative Design Solutions, Inc
Business Acquisition
Identifiable intangible assets																	$ 3,180