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Acquisitions, Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2020 | Dec. 31, 2019 | Aug. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration, net of cash acquired |  |  |  | $ 95,766 | $ 0 |
Measurement period adjustments |  |  |  | 12,027 |  |
Goodwill |  | $ 351,114 |  | 399,360 |  | $ 351,114
Polyplastic |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of interests acquired | 100.00% |  |  |  |  |
Cash consideration, net of cash acquired | $ 95,766 |  |  |  |  |
Contingent consideration maximum | 7,700 |  |  |  |  |
Total fair value of consideration given | $ 98,562 |  |  |  |  |
Acquired intangible assets useful life | 15 years |  |  |  |  |
Identifiable intangible assets | $ 53,674 |  |  |  |  |
Net tangible assets | 7,234 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 60,908 |  |  |  |  |
Goodwill | $ 37,654 |  |  |  |  |
CURT |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of interests acquired |  | 100.00% |  |  |  | 100.00%
Cash consideration, net of cash acquired |  | $ 337,640 |  | 337,640 |  |
Other tangible assets |  |  |  | (497) |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets |  |  |  | (13,493) |  |
Measurement period adjustments |  |  |  | 13,493 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | 234,721 |  | 221,228 |  | $ 234,721
Goodwill |  | $ 102,919 |  | 116,412 |  | 102,919
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 |  |  |  |
CURT | Customer Relationships |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets |  |  |  | (7,800) |  |
Identifiable intangible assets |  | $ 112,000 |  | 104,200 |  | 112,000
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 |  |  |
Intangible assets |  |  |  | 2,170 |  |
Other tangible assets |  |  |  | (705) |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets |  |  |  | 1,465 |  |
Measurement period adjustments |  |  |  | (1,465) |  |
Identifiable intangible assets |  | 19,580 |  | 21,750 |  | 19,580
Net tangible assets |  | 3,286 |  | 2,581 |  | 3,286
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | 22,866 |  | 24,331 |  | 22,866
Goodwill |  | $ 20,358 |  | $ 18,893 |  | $ 20,358
Lewmar Marine Limited | Customer Relationships |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired intangible assets useful life |  |  | 15 years |  |  |

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