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Condensed Consolidating Financial Information Provided in Connection with Outstanding Debt of Subsidiaries (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Cash flows (used in) provided by operating activities |  |
Net cash (used in) provided by operating activities | $ 888,526 | $ 601,702
Cash flows used in investing activities |  |
Proceeds from sales and maturities of fixed maturity investments trading | 8,221,481 | 7,663,002
Purchases of fixed maturity investments trading | (8,692,688) | (7,798,285)
Net (purchases) sales of equity investments trading | 15,490 | 61,571
Net purchases of short term investments | (1,465,451) | (146,326)
Net purchases of other investments | (130,649) | 5,181
Net purchases of investments in other ventures | (20,952) | 0
Return of investment from investment in other ventures | 8,464 | 20,000
Dividends and return of capital from subsidiaries | 0 | 0
Contributions to subsidiaries | 0 | 0
Due (from) to subsidiary | 0 | 0
Net cash used in investing activities | (2,064,305) | (194,857)
Cash flows provided by (used in) financing activities |  |
Dividends paid – RenaissanceRe common shares | (39,611) | (38,624)
Dividends paid – preference shares | (20,899) | (16,786)
Issuance of preference shares, net of expenses | 242,371 | 0
RenaissanceRe common share repurchases | 0 | (188,591)
Repayment of debt |  | (250,000)
Issuance of debt, net of expenses | 0 | 295,866
Net third party redeemable noncontrolling interest share transactions | 96,021 | (44,193)
Taxes paid on withholding shares | (7,079) | (13,694)
Net cash provided by (used in) financing activities | 270,803 | (256,022)
Effect of exchange rate changes on foreign currency cash | (3,575) | 9,596
Net (decrease) increase in cash and cash equivalents | (908,551) | 160,419
Cash and cash equivalents, beginning of period | 1,361,592 | 421,157
Cash and cash equivalents, end of period | 453,041 | 581,576
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer) |  |
Cash flows (used in) provided by operating activities |  |
Net cash (used in) provided by operating activities | 1,496 | (8,209)
Cash flows used in investing activities |  |
Proceeds from sales and maturities of fixed maturity investments trading | 91,118 | 74,455
Purchases of fixed maturity investments trading | (65,988) | (69,168)
Net (purchases) sales of equity investments trading | (624) | (1,708)
Net purchases of short term investments | 360 | (4,495)
Net purchases of other investments | 0 | 0
Net purchases of investments in other ventures | 0 |
Return of investment from investment in other ventures | 0 | 0
Dividends and return of capital from subsidiaries | 0 | 9,175
Contributions to subsidiaries | (16,847) | 0
Due (from) to subsidiary | (9,598) | 14
Net cash used in investing activities | (1,579) | 8,273
Cash flows provided by (used in) financing activities |  |
Dividends paid – RenaissanceRe common shares | 0 | 0
Dividends paid – preference shares | 0 | 0
Issuance of preference shares, net of expenses | 0 |
RenaissanceRe common share repurchases |  | 0
Repayment of debt |  | 0
Issuance of debt, net of expenses |  | 0
Net third party redeemable noncontrolling interest share transactions | 0 | 0
Taxes paid on withholding shares | 0 | 0
Net cash provided by (used in) financing activities | 0 | 0
Effect of exchange rate changes on foreign currency cash | 0 | 0
Net (decrease) increase in cash and cash equivalents | (83) | 64
Cash and cash equivalents, beginning of period | 139 | 162
Cash and cash equivalents, end of period | 56 | 226
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer) |  |
Cash flows (used in) provided by operating activities |  |
Net cash (used in) provided by operating activities |  | (2,262)
Cash flows used in investing activities |  |
Proceeds from sales and maturities of fixed maturity investments trading |  | 289,741
Purchases of fixed maturity investments trading |  | (143,991)
Net (purchases) sales of equity investments trading |  | 85,324
Net purchases of short term investments |  | 41,299
Net purchases of other investments |  | 0
Return of investment from investment in other ventures |  | 0
Dividends and return of capital from subsidiaries |  | 0
Contributions to subsidiaries |  | (26,649)
Due (from) to subsidiary |  | (123)
Net cash used in investing activities |  | 245,601
Cash flows provided by (used in) financing activities |  |
Dividends paid – RenaissanceRe common shares |  | 0
Dividends paid – preference shares |  | 0
RenaissanceRe common share repurchases |  | 0
Repayment of debt |  | (250,000)
Issuance of debt, net of expenses |  | 0
Net third party redeemable noncontrolling interest share transactions |  | 0
Taxes paid on withholding shares |  | 0
Net cash provided by (used in) financing activities |  | (250,000)
Effect of exchange rate changes on foreign currency cash |  | 0
Net (decrease) increase in cash and cash equivalents |  | (6,661)
Cash and cash equivalents, beginning of period |  | 6,671
Cash and cash equivalents, end of period |  | 10
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer) |  |
Cash flows (used in) provided by operating activities |  |
Net cash (used in) provided by operating activities | 16,194 | (343,093)
Cash flows used in investing activities |  |
Proceeds from sales and maturities of fixed maturity investments trading | 45,459 | 279,830
Purchases of fixed maturity investments trading | (20,806) | (270,785)
Net (purchases) sales of equity investments trading | 0 | 0
Net purchases of short term investments | (9,206) | (305)
Net purchases of other investments | 0 | 0
Net purchases of investments in other ventures | 0 |
Return of investment from investment in other ventures | 0 | 0
Dividends and return of capital from subsidiaries | 0 | 41,866
Contributions to subsidiaries | (65,000) | (9,175)
Due (from) to subsidiary | 36,262 | 4,062
Net cash used in investing activities | (13,291) | 45,493
Cash flows provided by (used in) financing activities |  |
Dividends paid – RenaissanceRe common shares | 0 | 0
Dividends paid – preference shares | 0 | 0
Issuance of preference shares, net of expenses | 0 |
RenaissanceRe common share repurchases |  | 0
Repayment of debt |  | 0
Issuance of debt, net of expenses |  | 295,866
Net third party redeemable noncontrolling interest share transactions | 0 | 0
Taxes paid on withholding shares | 0 | 0
Net cash provided by (used in) financing activities | 0 | 295,866
Effect of exchange rate changes on foreign currency cash | 0 | 0
Net (decrease) increase in cash and cash equivalents | 2,903 | (1,734)
Cash and cash equivalents, beginning of period | 1,469 | 9,397
Cash and cash equivalents, end of period | 4,372 | 7,663
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |
Cash flows (used in) provided by operating activities |  |
Net cash (used in) provided by operating activities | (5,869) | (6,870)
Cash flows used in investing activities |  |
Proceeds from sales and maturities of fixed maturity investments trading | 384,818 | 106,761
Purchases of fixed maturity investments trading | (281,994) | (118,402)
Net (purchases) sales of equity investments trading | 0 | 0
Net purchases of short term investments | 85,598 | 205,864
Net purchases of other investments | 0 | 0
Net purchases of investments in other ventures | 0 |
Return of investment from investment in other ventures | 0 | 0
Dividends and return of capital from subsidiaries | 511,098 | 285,515
Contributions to subsidiaries | (686,106) | (500,000)
Due (from) to subsidiary | (193,249) | 290,130
Net cash used in investing activities | (179,835) | 269,868
Cash flows provided by (used in) financing activities |  |
Dividends paid – RenaissanceRe common shares | (39,611) | (38,624)
Dividends paid – preference shares | (20,899) | (16,786)
Issuance of preference shares, net of expenses | 242,371 |
RenaissanceRe common share repurchases |  | (188,591)
Repayment of debt |  | 0
Issuance of debt, net of expenses |  | 0
Net third party redeemable noncontrolling interest share transactions | 0 | 0
Taxes paid on withholding shares | (7,079) | (13,694)
Net cash provided by (used in) financing activities | 174,782 | (257,695)
Effect of exchange rate changes on foreign currency cash | 0 | 0
Net (decrease) increase in cash and cash equivalents | (10,922) | 5,303
Cash and cash equivalents, beginning of period | 14,656 | 7,067
Cash and cash equivalents, end of period | 3,734 | 12,370
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries) |  |
Cash flows (used in) provided by operating activities |  |
Net cash (used in) provided by operating activities | 876,705 | 962,136
Cash flows used in investing activities |  |
Proceeds from sales and maturities of fixed maturity investments trading | 7,700,086 | 6,912,215
Purchases of fixed maturity investments trading | (8,323,900) | (7,195,939)
Net (purchases) sales of equity investments trading | 16,114 | (22,045)
Net purchases of short term investments | (1,542,203) | (388,689)
Net purchases of other investments | (130,649) | 5,181
Net purchases of investments in other ventures | (20,952) |
Return of investment from investment in other ventures | 8,464 | 20,000
Dividends and return of capital from subsidiaries | (511,098) | (336,556)
Contributions to subsidiaries | 767,953 | 535,824
Due (from) to subsidiary | 166,585 | (294,083)
Net cash used in investing activities | (1,869,600) | (764,092)
Cash flows provided by (used in) financing activities |  |
Dividends paid – RenaissanceRe common shares | 0 | 0
Dividends paid – preference shares | 0 | 0
Issuance of preference shares, net of expenses | 0 |
RenaissanceRe common share repurchases |  | 0
Repayment of debt |  | 0
Issuance of debt, net of expenses |  | 0
Net third party redeemable noncontrolling interest share transactions | 96,021 | (44,193)
Taxes paid on withholding shares | 0 | 0
Net cash provided by (used in) financing activities | 96,021 | (44,193)
Effect of exchange rate changes on foreign currency cash | (3,575) | 9,596
Net (decrease) increase in cash and cash equivalents | (900,449) | 163,447
Cash and cash equivalents, beginning of period | 1,345,328 | 397,860
Cash and cash equivalents, end of period | $ 444,879 | $ 561,307

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- Definition The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition The cash inflow associated with the sale, maturities, repayments and calls of securities classified as trading securities and held for investment purposes. Excludes proceeds from trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time). + References No definition available. + Details
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