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Acquisitions, Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 31, 2020 | Dec. 31, 2019 | Aug. 31, 2019 | Mar. 31, 2020 | Jun. 30, 2020 | Jun. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration, net of cash acquired |  |  |  |  | $ 94,713 | $ 8,530
Benefit obligation measurement, discount rate |  |  |  |  | 1.20% |
Benefit obligation measurement, expected rate of return on plan assets |  |  |  |  | 1.20% |
Benefit obligation measurement, wage inflation |  |  |  |  | 2.00% |
Minimum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Benefit obligation measurement, expected indexation |  |  |  |  | 0.00% |
Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Benefit obligation measurement, expected indexation |  |  |  |  | 2.00% |
Polyplastic |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of interests acquired | 100.00% |  |  |  |  |
Cash consideration, net of cash acquired | $ 95,766 |  |  |  |  |
Contingent consideration maximum | $ 7,700 |  |  |  |  |
Acquired intangible assets useful life | 15 years |  |  |  |  |
Total fair value of consideration given | $ 98,562 |  |  |  |  |
CURT |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of interests acquired |  | 100.00% |  |  |  |
Cash consideration, net of cash acquired |  | $ 337,640 |  |  | $ 336,587 |
CURT | Minimum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets useful life |  | 16 years |  |  |  |
CURT | Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets useful life |  | 20 years |  |  |  |
Lewmar Marine Limited |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of interests acquired |  |  | 100.00% |  |  |
Cash consideration, net of cash acquired |  |  |  | $ 43,224 | $ 43,224 |
Total fair value of consideration given |  |  | $ 43,200 |  |  |
Lewmar Marine Limited | Customer Relationships |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets useful life |  |  | 15 years |  |  |

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