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Acquisition of Tokio Millennium Re (Schedule of Fair Value of Net Assets Acquired and Liabilities Assumed) (Details) - TMR Group Entities - USD ($) $ in Thousands | Mar. 22, 2019 | Sep. 30, 2019 | Mar. 31, 2019
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Business Acquisition [Line Items] |  |  |
Shareholders’ equity of the TMR Group Entities at March 22, 2019 | $ 1,032,961 |  |
Adjustments for fair value, by applicable balance sheet caption: |  |  |
Net deferred acquisition costs and value of business acquired | (56,788) |  |
Net reserve for claims and claim expenses | 67,782 |  |
Goodwill and intangible assets at March 22, 2019 of the TMR Group Entities | (6,569) |  |
Total adjustments for fair value by applicable balance sheet caption before tax impact | 4,425 |  |
Other assets - net deferred tax liability related to fair value adjustments and value of business acquired | (2,606) |  |
Total adjustments for fair value by applicable balance sheet caption, net of tax | 1,819 |  |
Adjustments for fair value of the identifiable intangible assets: |  |  |
Identifiable indefinite lived intangible assets (insurance licenses) | 6,800 |  |
Identifiable finite lived intangible assets (top broker relationships and renewal rights) | 11,200 |  |
Identifiable intangible assets before tax impact | 18,000 | $ 17,460 |
Other assets - deferred tax liability on identifiable intangible assets | (2,281) |  |
Total adjustments for fair value of the identifiable intangible assets and value of business acquired, net of tax | 15,719 |  |
Total adjustments for fair value by applicable balance sheet caption, identifiable intangible assets and value of business acquired, net of tax | 17,538 |  |
Shareholders’ equity of the TMR Group Entities at fair value | 1,050,499 |  |
Total net purchase price paid by RenaissanceRe | 1,063,593 |  |
Excess purchase price over the fair value of net assets acquired assigned to goodwill | 13,094 |  | $ 13,100
Insurance licenses |  |  |
Adjustments for fair value of the identifiable intangible assets: |  |  |
Identifiable indefinite lived intangible assets (insurance licenses) | 6,800 |  |
Top Broker Relationships and Renewal Rights |  |  |
Adjustments for fair value of the identifiable intangible assets: |  |  |
Identifiable finite lived intangible assets (top broker relationships and renewal rights) | $ 11,200 |  |

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