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Condensed Consolidating Financial Information Provided in Connection with Outstanding Debt of Subsidiaries (Condensed Consolidating Statement of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | $ 448,855 | $ 251,867 | $ 801,983 | $ 344,074
Change in net unrealized gains on investments, net of tax | 1,309 | (1,295) | 1,272 | (1,325)
Accumulated other comprehensive loss | (3,708) |  | (3,708) |
Comprehensive income | 446,456 | 250,572 | 799,547 | 342,749
Net (income) loss attributable to redeemable noncontrolling interests | (71,812) | (54,483) | (142,034) | (84,382)
Comprehensive (income) loss attributable to redeemable noncontrolling interests | (71,812) | (54,483) | (142,034) | (84,382)
Comprehensive income attributable to RenaissanceRe | 374,644 | 196,089 | 657,513 | 258,367
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer) |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 6,940 | 2,517 | 14,706 | 2,789
Change in net unrealized gains on investments, net of tax | 0 | 0 | 0 | 0
Accumulated other comprehensive loss | 0 |  | 0 |
Comprehensive income | 6,940 | 2,517 | 14,706 | 2,789
Net (income) loss attributable to redeemable noncontrolling interests | 0 | 0 | 0 | 0
Comprehensive (income) loss attributable to redeemable noncontrolling interests | 0 | 0 | 0 | 0
Comprehensive income attributable to RenaissanceRe | 6,940 | 2,517 | 14,706 | 2,789
Reportable Legal Entities | RenaissanceRe Finance Inc. (Subsidiary Issuer) |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 15,288 | 7,422 | 32,031 | (12,712)
Change in net unrealized gains on investments, net of tax | 0 | 0 | 0 | 0
Accumulated other comprehensive loss | 0 |  | 0 |
Comprehensive income | 15,288 | 7,422 | 32,031 | (12,712)
Net (income) loss attributable to redeemable noncontrolling interests | 0 | 0 | 0 | 0
Comprehensive (income) loss attributable to redeemable noncontrolling interests | 0 | 0 | 0 | 0
Comprehensive income attributable to RenaissanceRe | 15,288 | 7,422 | 32,031 | (12,712)
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 377,043 | 197,384 | 659,949 | 259,692
Change in net unrealized gains on investments, net of tax | 0 | 0 | 0 | 0
Accumulated other comprehensive loss | 0 |  | 0 |
Comprehensive income | 377,043 | 197,384 | 659,949 | 259,692
Net (income) loss attributable to redeemable noncontrolling interests | 0 | 0 | 0 | 0
Comprehensive (income) loss attributable to redeemable noncontrolling interests | 0 | 0 | 0 | 0
Comprehensive income attributable to RenaissanceRe | 377,043 | 197,384 | 659,949 | 259,692
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-Guarantor Subsidiaries) |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | 500,809 | 269,014 | 895,965 | 375,671
Change in net unrealized gains on investments, net of tax | 1,309 | (1,295) | 1,272 | (1,325)
Accumulated other comprehensive loss | (3,708) |  | (3,708) |
Comprehensive income | 498,410 | 267,719 | 893,529 | 374,346
Net (income) loss attributable to redeemable noncontrolling interests | (71,812) | (54,483) | (142,034) | (84,382)
Comprehensive (income) loss attributable to redeemable noncontrolling interests | (71,812) | (54,483) | (142,034) | (84,382)
Comprehensive income attributable to RenaissanceRe | 426,598 | 213,236 | 751,495 | 289,964
Consolidating Adjustments |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income | (451,225) | (224,470) | (800,668) | (281,366)
Change in net unrealized gains on investments, net of tax | 0 | 0 | 0 | 0
Accumulated other comprehensive loss | 0 |  | 0 |
Comprehensive income | (451,225) | (224,470) | (800,668) | (281,366)
Net (income) loss attributable to redeemable noncontrolling interests | 0 | 0 | 0 | 0
Comprehensive (income) loss attributable to redeemable noncontrolling interests | 0 | 0 | 0 | 0
Comprehensive income attributable to RenaissanceRe | $ (451,225) | $ (224,470) | $ (800,668) | $ (281,366)

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