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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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Jun. 30, 2017 | Feb. 01, 2017 | May 31, 2017 | Nov. 30, 2016 | May 31, 2016 | Feb. 29, 2016 | Jan. 31, 2016 | Aug. 31, 2015 | Apr. 30, 2015 | Jan. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | May 01, 2017 | Apr. 30, 2014
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration, net of cash acquired |  |  |  |  |  |  |  |  |  |  | $ 60,588 | $ 48,725 | $ 41,058 |  |
Goodwill (tax deductible) |  |  |  |  |  |  |  |  |  |  | $ 124,183 | 89,198 | $ 83,619 |  |
Sessa Klein S.p.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration, net of cash acquired |  | $ 6,502 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  | 8,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | 4,922 |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of consideration given |  | 11,424 |  |  |  |  |  |  |  |  |  |  |  |  |
Net tangible assets |  | 585 |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of net assets acquired |  | 5,103 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill (tax deductible) |  | 6,321 |  |  |  |  |  |  |  |  |  |  |  |  |
Metallarte S.r.l. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration, net of cash acquired | $ 13,501 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration | 14,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration | 2,366 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of consideration given | 15,867 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net other liabilities | (320) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of net assets acquired | 8,830 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill (tax deductible) | 7,037 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lexington |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  | $ 40,062 |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of consideration given |  |  | $ 40,100 |  |  |  |  |  |  |  |  |  |  |  |
Net tangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,928 |
Total fair value of net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,648 |
Goodwill (tax deductible) |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,414 |
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 |  |  |  | 10,915 |  |  |  |  |  |  |  |  |  |  |
Total fair value of net assets acquired |  |  |  | 12,415 |  |  |  |  |  |  |  |  |  |  |
Project 2000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration, net of cash acquired |  |  |  |  | $ 16,618 |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  | 18,800 |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  | 1,322 |  |  |  |  |  |  |  |  |  |
Total fair value of consideration given |  |  |  |  | 17,940 |  |  |  |  |  |  |  |  |  |
Net other liabilities |  |  |  |  | (3,482) |  |  |  |  |  |  |  |  |  |
Total fair value of net assets acquired |  |  |  |  | 12,355 |  |  |  |  |  |  |  |  |  |
Goodwill (tax deductible) |  |  |  |  | 5,585 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |
Customer Relationships | Sessa Klein S.p.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  | 3,189 |  |  |  |  |  |  |  |  |  |  |  |  |
Customer Relationships | Metallarte S.r.l. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets | 7,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer Relationships | Lexington |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,900 |
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 |  |  |  | $ 1,500 |  |  |  |  |  |  |  |  |  |  |
Customer Relationships | Project 2000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | 9,696 |  |  |  |  |  |  |  |  |  |
Customer Relationships | Signature Seating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  | $ 7,500 |  |  |  |  |  |  |
Customer Relationships | Spectal Industries, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,100
Other Identifiable Intangible Assets | Sessa Klein S.p.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  | $ 1,329 |  |  |  |  |  |  |  |  |  |  |  |  |
Other Identifiable Intangible Assets | Metallarte S.r.l. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets | $ 2,150 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Identifiable Intangible Assets | Lexington |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,820 |
Other Identifiable Intangible Assets | Project 2000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | $ 6,141 |  |  |  |  |  |  |  |  |  |
Other Identifiable Intangible Assets | EA Technologies, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  |  | $ 480 |  |  |  |  |

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