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Schedule II. Condensed Financial Information Of Registrant (Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ (74,717) | $ 42,389 | $ 197,384 | $ 62,308 | $ 2,143 | $ (499,217) | $ 176,738 | $ 97,947 | $ 227,364 | $ (222,389) | $ 502,962
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  | 225,707 | (223,298) | 501,987
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 227,364 | (222,389) | 502,962
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  | $ 227,364 | $ (222,389) | $ 502,962

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