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Condensed Consolidating Financial Information Provided in Connection with Outstanding Debt of Subsidiaries (Condensed Consolidating Statement of Comprehensive (Loss) Income (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) | $ (123,986) | $ 48,829 | $ 251,867 | $ 92,207 | $ 2,199 | $ (703,494) | $ 214,350 | $ 132,274 | $ 268,917 | $ (354,671) | $ 630,048
Change in net unrealized (losses) gains on investments |  |  |  |  |  |  |  |  | (1,657) | (909) | (975)
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 267,260 | (355,580) | 629,073
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | (41,553) | 132,282 | (127,086)
Comprehensive income attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | (41,553) | 132,282 | (127,086)
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  | 225,707 | (223,298) | 501,987
RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  | 227,364 | (222,389) | 502,962
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 227,364 | (222,389) | 502,962
Change in net unrealized (losses) gains on investments |  |  |  |  |  |  |  |  | 0 | 0 | 0
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 227,364 | (222,389) | 502,962
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Comprehensive income attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  | 227,364 | (222,389) | 502,962
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries) |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 349,780 | (285,838) | 681,025
Change in net unrealized (losses) gains on investments |  |  |  |  |  |  |  |  | (1,657) | (909) | (975)
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 348,123 | (286,747) | 680,050
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | (41,553) | 132,282 | (127,086)
Comprehensive income attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | (41,553) | 132,282 | (127,086)
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  | 306,570 | (154,465) | 552,964
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer) |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 3,936 | (5,926) | 8,002
Change in net unrealized (losses) gains on investments |  |  |  |  |  |  |  |  | 0 | 0 | 0
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 3,936 | (5,926) | 8,002
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Comprehensive income attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  | 3,936 | (5,926) | 8,002
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer) |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | 30,596 | 29,591
Change in net unrealized (losses) gains on investments |  |  |  |  |  |  |  |  |  | 0 | 0
Comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 30,596 | 29,591
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 | 0
Comprehensive income attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 | 0
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  |  | 30,596 | 29,591
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer) |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | (47,395) | (38,871) | 1,922
Change in net unrealized (losses) gains on investments |  |  |  |  |  |  |  |  | 0 | 0 | 0
Comprehensive income (loss) |  |  |  |  |  |  |  |  | (47,395) | (38,871) | 1,922
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Comprehensive income attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  | (47,395) | (38,871) | 1,922
Consolidating Adjustments |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | (264,768) | 167,757 | (593,454)
Change in net unrealized (losses) gains on investments |  |  |  |  |  |  |  |  | 0 | 0 | 0
Comprehensive income (loss) |  |  |  |  |  |  |  |  | (264,768) | 167,757 | (593,454)
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Comprehensive income attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  | $ (264,768) | $ 167,757 | $ (593,454)

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