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Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Business Acquisitions) (Details) - USD ($) $ in Thousands |  |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Feb. 01, 2017 | Jun. 30, 2018 | Feb. 28, 2018 | Jan. 31, 2018 | Jun. 30, 2017 | May 31, 2017 | Feb. 28, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | May 01, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration net of cash acquired |  |  |  |  |  |  |  |  | $ 156,701 | $ 67,876 |  |
Goodwill |  |  |  |  |  |  |  |  | $ 163,211 | $ 123,001 | $ 124,183 |
STLA |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interests acquired |  |  |  |  |  |  |  |  | 100.00% |  |  |
Cash consideration |  |  | $ 14,845 |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  | $ 7,000 |  |  |
Net tangible assets |  |  |  |  |  |  |  |  | 2,280 |  |  |
Total fair value of net assets acquired |  |  |  |  |  |  |  |  | 9,280 |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 5,565 |  |  |
Hehr |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  | $ 51,460 |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  | 21,500 |  |  |  |  |  |  |  |
Net tangible assets |  |  |  | 13,020 |  |  |  |  |  |  |  |
Total fair value of net assets acquired |  |  |  | 34,520 |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 16,940 |  |  |  |  |  |  |  |
Metallarte S.r.l. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interests acquired |  |  |  |  |  |  |  |  |  | 100.00% |  |
Cash consideration |  |  |  |  |  | $ 14,100 |  |  |  |  |  |
Cash consideration net of cash acquired | $ 13,501 |  |  |  |  |  |  |  |  |  |  |
Contingent consideration | 2,366 |  |  |  |  |  |  |  |  |  |  |
Total fair value of consideration given | $ 15,867 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Other Liabilities |  |  |  |  |  |  |  |  |  | $ (327) |  |
Total fair value of net assets acquired |  |  |  |  |  |  |  |  |  | 8,926 |  |
Goodwill |  |  |  |  |  |  |  |  |  | 6,941 |  |
Taylor Made |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interests acquired |  |  |  |  | 100.00% |  |  |  |  |  |  |
Cash consideration |  |  |  |  | $ 90,396 |  |  |  |  |  |  |
Net tangible assets |  |  |  |  | 42,133 |  |  |  |  |  |  |
Total fair value of net assets acquired |  |  |  |  | 74,133 |  |  |  |  |  |  |
Goodwill |  |  |  |  | 16,263 |  |  |  |  |  |  |
Lexington |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  | $ 40,062 |  |  |  |  |
Total fair value of consideration given |  |  |  |  |  |  | $ 40,100 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Other Liabilities |  |  |  |  |  |  |  |  |  |  |  | $ 4,928
Total fair value of net assets acquired |  |  |  |  |  |  |  |  |  |  |  | 23,648
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 16,414
SessaKlein S.p.A. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interests acquired |  |  |  |  |  |  |  | 100.00% |  |  |  |
Cash consideration net of cash acquired |  | $ 6,502 |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | 3,838 |  |  |  |  |  |  |  |  |  |
Total fair value of consideration given |  | $ 10,340 |  |  |  |  |  | $ 6,500 |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  | 2,286 |  |  |  |
Net tangible assets |  |  |  |  |  |  |  | 364 |  |  |  |
Total fair value of net assets acquired |  |  |  |  |  |  |  | 2,650 |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 7,690 |  |  |  |
Customer Relationships | Metallarte S.r.l. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  |  | 7,311 |  |
Customer Relationships | Taylor Made |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | 25,000 |  |  |  |  |  |  |
Customer Relationships | Lexington |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  |  |  |  | 16,900
Other Intangible Assets | Metallarte S.r.l. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  |  | $ 1,942 |  |
Other Intangible Assets | Taylor Made |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | $ 7,000 |  |  |  |  |  |  |
Other Intangible Assets | Lexington |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  |  |  |  | $ 1,820

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