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Schedule II. Condensed Financial Information Of Registrant (Statements of Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 42,962 | $ 45,887 | $ 377,043 | $ 282,906 | $ (74,717) | $ 42,389 | $ 197,384 | $ 62,308 | $ 748,798 | $ 227,364 | $ (222,389) |
Change in net unrealized gains on investments, net of tax |  |  |  |  |  |  |  |  | 2,173 | (1,657) | (909) |
Foreign currency translation adjustments, net of tax |  |  |  |  |  |  |  |  | (2,679) | 0 | 0 |
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  | 748,292 | 225,707 | (223,298) |
Parent Company |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 748,798 | 227,364 | (222,389) |
Change in net unrealized gains on investments, net of tax |  |  |  |  |  |  |  |  | 2,173 | (1,657) | (909) |
Foreign currency translation adjustments, net of tax |  |  |  |  |  |  |  |  | (2,679) | 0 |  | $ 0
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  | $ 748,292 | $ 225,707 | $ (223,298) |

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