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Acquisitions, Goodwill And Other Intangible Assets (Schedule of Business Acquisitions) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |
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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

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