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Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues |  |  |  |  |  |  |  |  |  |  |
Net premiums earned | $ 421,473 | $ 547,792 | $ 382,265 | $ 366,045 | $ 351,901 | $ 346,521 | $ 351,402 | $ 353,606 | $ 1,717,575 | $ 1,403,430 | $ 1,400,551
Net investment income | 73,464 | 40,257 | 54,163 | 54,325 | 47,316 | 51,423 | 54,124 | 28,863 | 222,209 | 181,726 | 152,567
Net foreign exchange gains (losses) | (490) | (156) | 3,109 | 8,165 | (5,420) | (5,986) | (690) | (1,692) | 10,628 | (13,788) | (3,051)
Equity in (losses) earnings of other ventures | 2,200 | 1,794 | 5,543 | (1,507) | 4,960 | (11,630) | 6,022 | 1,611 | 8,030 | 963 | 20,481
Other income | 2,362 | 2,996 | 2,392 | 1,665 | 5,177 | 2,268 | 2,654 | 4,079 | 9,415 | 14,178 | 13,472
Net realized and unrealized gains (losses) on investments | (7,716) | 42,052 | 58,113 | 43,373 | (49,967) | 59,870 | 69,772 | 61,653 | 135,822 | 141,328 | (68,918)
Total revenues | 491,293 | 634,735 | 505,585 | 472,066 | 353,967 | 442,466 | 483,284 | 448,120 | 2,103,679 | 1,727,837 | 1,515,102
Expenses |  |  |  |  |  |  |  |  |  |  |
Net claims and claim expenses incurred | 304,064 | 1,221,696 | 142,587 | 193,081 | 123,901 | 112,575 | 167,750 | 126,605 | 1,861,428 | 530,831 | 448,238
Acquisition expenses | 98,598 | 76,761 | 88,251 | 83,282 | 74,146 | 80,580 | 69,005 | 65,592 | 346,892 | 289,323 | 238,592
Operational expenses | 29,192 | 42,537 | 41,766 | 47,283 | 49,948 | 40,493 | 51,073 | 56,235 | 160,778 | 197,749 | 219,112
Corporate expenses | 4,237 | 4,413 | 4,636 | 5,286 | 11,888 | 11,537 | 5,752 | 8,225 | 18,572 | 37,402 | 76,514
Interest expense | 11,777 | 11,799 | 10,091 | 10,526 | 10,534 | 10,536 | 10,536 | 10,538 | 44,193 | 42,144 | 36,270
Total expenses | 447,868 | 1,357,206 | 287,331 | 339,458 | 270,417 | 255,721 | 304,116 | 267,195 | 2,431,863 | 1,097,449 | 1,018,726
(Loss) income before equity in net income of subsidiaries and taxes |  |  |  |  |  |  |  |  | (328,184) | 630,388 | 496,376
Equity in net (loss) income of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
(Loss) income before taxes | 43,425 | (722,471) | 218,254 | 132,608 | 83,550 | 186,745 | 179,168 | 180,925 | (328,184) | 630,388 | 496,376
Income tax (expense) benefit | (41,226) | 18,977 | (3,904) | (334) | 7,700 | 1,316 | (6,612) | (2,744) | (26,487) | (340) | 45,866
Net (loss) income | 2,199 | (703,494) | 214,350 | 132,274 | 91,250 | 188,061 | 172,556 | 178,181 | (354,671) | 630,048 | 542,242
Net (income) loss attributable to redeemable noncontrolling interests | (56) | 204,277 | (37,612) | (34,327) | (16,219) | (35,641) | (30,635) | (44,591) | 132,282 | (127,086) | (111,050)
Net (loss) income attributable to RenaissanceRe | 2,143 | (499,217) | 176,738 | 97,947 | 75,031 | 152,420 | 141,921 | 133,590 | (222,389) | 502,962 | 431,192
Dividends on preference shares | (5,595) | (5,595) | (5,596) | (5,595) | (5,595) | (5,595) | (5,596) | (5,595) | (22,381) | (22,381) | (22,381)
Net (loss) income (attributable) available to RenaissanceRe common shareholders | $ (3,452) | $ (504,812) | $ 171,142 | $ 92,352 | $ 69,436 | $ 146,825 | $ 136,325 | $ 127,995 | (244,770) | 480,581 | 408,811
RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 23,109 | 24,178 | 15,391
Net foreign exchange gains (losses) |  |  |  |  |  |  |  |  | (1) | (2) | 4
Other income |  |  |  |  |  |  |  |  | 0 | (772) | 663
Net realized and unrealized gains (losses) on investments |  |  |  |  |  |  |  |  | (1,357) | 4,151 | (2,080)
Total revenues |  |  |  |  |  |  |  |  | 21,751 | 27,555 | 13,978
Expenses |  |  |  |  |  |  |  |  |  |  |
Operational expenses |  |  |  |  |  |  |  |  | 11,314 | 13,716 | 4,249
Corporate expenses |  |  |  |  |  |  |  |  | 18,546 | 26,848 | 40,808
Interest expense |  |  |  |  |  |  |  |  | 1,572 | 562 | 1,255
Total expenses |  |  |  |  |  |  |  |  | 31,432 | 41,126 | 46,312
(Loss) income before equity in net income of subsidiaries and taxes |  |  |  |  |  |  |  |  | (9,681) | (13,571) | (32,334)
Equity in net (loss) income of subsidiaries |  |  |  |  |  |  |  |  | (212,708) | 516,533 | 463,526
Net (loss) income attributable to RenaissanceRe |  |  |  |  |  |  |  |  | (222,389) | 502,962 | 431,192
Dividends on preference shares |  |  |  |  |  |  |  |  | (22,381) | (22,381) | (22,381)
Net (loss) income (attributable) available to RenaissanceRe common shareholders |  |  |  |  |  |  |  |  | (244,770) | 480,581 | 408,811
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net investment income |  |  |  |  |  |  |  |  | 23,109 | 24,178 | 15,391
Net foreign exchange gains (losses) |  |  |  |  |  |  |  |  | (1) | (2) | 4
Equity in (losses) earnings of other ventures |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income |  |  |  |  |  |  |  |  | 0 | (772) | 663
Net realized and unrealized gains (losses) on investments |  |  |  |  |  |  |  |  | (1,357) | 4,151 | (2,080)
Total revenues |  |  |  |  |  |  |  |  | 21,751 | 27,555 | 13,978
Expenses |  |  |  |  |  |  |  |  |  |  |
Net claims and claim expenses incurred |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operational expenses |  |  |  |  |  |  |  |  | 11,314 | 13,716 | 4,249
Corporate expenses |  |  |  |  |  |  |  |  | 18,546 | 26,848 | 40,808
Interest expense |  |  |  |  |  |  |  |  | 1,572 | 562 | 1,255
Total expenses |  |  |  |  |  |  |  |  | 31,432 | 41,126 | 46,312
(Loss) income before equity in net income of subsidiaries and taxes |  |  |  |  |  |  |  |  | (9,681) | (13,571) | (32,334)
Equity in net (loss) income of subsidiaries |  |  |  |  |  |  |  |  | (212,708) | 516,533 | 463,526
(Loss) income before taxes |  |  |  |  |  |  |  |  | (222,389) | 502,962 | 431,192
Income tax (expense) benefit |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net (loss) income |  |  |  |  |  |  |  |  | (222,389) | 502,962 | 431,192
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net (loss) income attributable to RenaissanceRe |  |  |  |  |  |  |  |  | (222,389) | 502,962 | 431,192
Dividends on preference shares |  |  |  |  |  |  |  |  | (22,381) | (22,381) | (22,381)
Net (loss) income (attributable) available to RenaissanceRe common shareholders |  |  |  |  |  |  |  |  | (244,770) | 480,581 | 408,811
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries) |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 1,717,575 | 1,403,430 | 1,400,551
Net investment income |  |  |  |  |  |  |  |  | 219,490 | 175,407 | 144,642
Net foreign exchange gains (losses) |  |  |  |  |  |  |  |  | 10,629 | (13,786) | (3,055)
Equity in (losses) earnings of other ventures |  |  |  |  |  |  |  |  | 8,253 | 963 | 20,481
Other income |  |  |  |  |  |  |  |  | 9,415 | 14,950 | 13,472
Net realized and unrealized gains (losses) on investments |  |  |  |  |  |  |  |  | 123,121 | 124,279 | (64,804)
Total revenues |  |  |  |  |  |  |  |  | 2,088,483 | 1,705,243 | 1,511,287
Expenses |  |  |  |  |  |  |  |  |  |  |
Net claims and claim expenses incurred |  |  |  |  |  |  |  |  | 1,861,428 | 530,831 | 448,238
Acquisition expenses |  |  |  |  |  |  |  |  | 346,892 | 289,323 | 238,592
Operational expenses |  |  |  |  |  |  |  |  | 141,572 | 176,041 | 207,802
Corporate expenses |  |  |  |  |  |  |  |  | 26 | 10,344 | 35,391
Interest expense |  |  |  |  |  |  |  |  | 10,075 | 10,062 | 7,677
Total expenses |  |  |  |  |  |  |  |  | 2,359,993 | 1,016,601 | 937,700
(Loss) income before equity in net income of subsidiaries and taxes |  |  |  |  |  |  |  |  | (271,510) | 688,642 | 573,587
Equity in net (loss) income of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
(Loss) income before taxes |  |  |  |  |  |  |  |  | (271,510) | 688,642 | 573,587
Income tax (expense) benefit |  |  |  |  |  |  |  |  | (14,328) | (7,617) | 5,686
Net (loss) income |  |  |  |  |  |  |  |  | (285,838) | 681,025 | 579,273
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 132,282 | (127,086) | (111,050)
Net (loss) income attributable to RenaissanceRe |  |  |  |  |  |  |  |  | (153,556) | 553,939 | 468,223
Dividends on preference shares |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net (loss) income (attributable) available to RenaissanceRe common shareholders |  |  |  |  |  |  |  |  | (153,556) | 553,939 | 468,223
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer) |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net investment income |  |  |  |  |  |  |  |  | 1,947 | 1,852 | 1,251
Net foreign exchange gains (losses) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in (losses) earnings of other ventures |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net realized and unrealized gains (losses) on investments |  |  |  |  |  |  |  |  | 9,621 | 4,659 | 566
Total revenues |  |  |  |  |  |  |  |  | 11,568 | 6,511 | 1,817
Expenses |  |  |  |  |  |  |  |  |  |  |
Net claims and claim expenses incurred |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operational expenses |  |  |  |  |  |  |  |  | 103 | (112) | 4,561
Corporate expenses |  |  |  |  |  |  |  |  | 0 | 203 | 312
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 7,233
Total expenses |  |  |  |  |  |  |  |  | 103 | 91 | 12,106
(Loss) income before equity in net income of subsidiaries and taxes |  |  |  |  |  |  |  |  | 11,465 | 6,420 | (10,289)
Equity in net (loss) income of subsidiaries |  |  |  |  |  |  |  |  | 756 | 3,857 | 5,493
(Loss) income before taxes |  |  |  |  |  |  |  |  | 12,221 | 10,277 | (4,796)
Income tax (expense) benefit |  |  |  |  |  |  |  |  | (18,147) | (2,275) | 32,005
Net (loss) income |  |  |  |  |  |  |  |  | (5,926) | 8,002 | 27,209
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net (loss) income attributable to RenaissanceRe |  |  |  |  |  |  |  |  | (5,926) | 8,002 | 27,209
Dividends on preference shares |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net (loss) income (attributable) available to RenaissanceRe common shareholders |  |  |  |  |  |  |  |  | (5,926) | 8,002 | 27,209
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer) |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net investment income |  |  |  |  |  |  |  |  | 1,373 | 3,989 | 4,063
Net foreign exchange gains (losses) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in (losses) earnings of other ventures |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net realized and unrealized gains (losses) on investments |  |  |  |  |  |  |  |  | 4,916 | 8,193 | (2,600)
Total revenues |  |  |  |  |  |  |  |  | 6,289 | 12,182 | 1,463
Expenses |  |  |  |  |  |  |  |  |  |  |
Net claims and claim expenses incurred |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operational expenses |  |  |  |  |  |  |  |  | 85 | 296 | 3
Corporate expenses |  |  |  |  |  |  |  |  | 0 | 0 | 3
Interest expense |  |  |  |  |  |  |  |  | 2,461 | 5,906 | 4,922
Total expenses |  |  |  |  |  |  |  |  | 2,546 | 6,202 | 4,928
(Loss) income before equity in net income of subsidiaries and taxes |  |  |  |  |  |  |  |  | 3,743 | 5,980 | (3,465)
Equity in net (loss) income of subsidiaries |  |  |  |  |  |  |  |  | 28,028 | 25,073 | 35,329
(Loss) income before taxes |  |  |  |  |  |  |  |  | 31,771 | 31,053 | 31,864
Income tax (expense) benefit |  |  |  |  |  |  |  |  | (1,175) | (1,462) | 1,985
Net (loss) income |  |  |  |  |  |  |  |  | 30,596 | 29,591 | 33,849
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net (loss) income attributable to RenaissanceRe |  |  |  |  |  |  |  |  | 30,596 | 29,591 | 33,849
Dividends on preference shares |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net (loss) income (attributable) available to RenaissanceRe common shareholders |  |  |  |  |  |  |  |  | 30,596 | 29,591 | 33,849
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer) |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net investment income |  |  |  |  |  |  |  |  | 3,090 | 569 | 996
Net foreign exchange gains (losses) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in (losses) earnings of other ventures |  |  |  |  |  |  |  |  | (223) | 0 | 0
Other income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net realized and unrealized gains (losses) on investments |  |  |  |  |  |  |  |  | (479) | 46 | 0
Total revenues |  |  |  |  |  |  |  |  | 2,388 | 615 | 996
Expenses |  |  |  |  |  |  |  |  |  |  |
Net claims and claim expenses incurred |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operational expenses |  |  |  |  |  |  |  |  | 26,063 | 22,152 | 2,503
Corporate expenses |  |  |  |  |  |  |  |  | 0 | 7 | 0
Interest expense |  |  |  |  |  |  |  |  | 31,657 | 26,176 | 16,179
Total expenses |  |  |  |  |  |  |  |  | 57,720 | 48,335 | 18,682
(Loss) income before equity in net income of subsidiaries and taxes |  |  |  |  |  |  |  |  | (55,332) | (47,720) | (17,686)
Equity in net (loss) income of subsidiaries |  |  |  |  |  |  |  |  | 9,298 | 38,628 | 72,925
(Loss) income before taxes |  |  |  |  |  |  |  |  | (46,034) | (9,092) | 55,239
Income tax (expense) benefit |  |  |  |  |  |  |  |  | 7,163 | 11,014 | 6,190
Net (loss) income |  |  |  |  |  |  |  |  | (38,871) | 1,922 | 61,429
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net (loss) income attributable to RenaissanceRe |  |  |  |  |  |  |  |  | (38,871) | 1,922 | 61,429
Dividends on preference shares |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net (loss) income (attributable) available to RenaissanceRe common shareholders |  |  |  |  |  |  |  |  | (38,871) | 1,922 | 61,429
Consolidating Adjustments |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net investment income |  |  |  |  |  |  |  |  | (26,800) | (24,269) | (13,776)
Net foreign exchange gains (losses) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in (losses) earnings of other ventures |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income |  |  |  |  |  |  |  |  | 0 | 0 | (663)
Net realized and unrealized gains (losses) on investments |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenues |  |  |  |  |  |  |  |  | (26,800) | (24,269) | (14,439)
Expenses |  |  |  |  |  |  |  |  |  |  |
Net claims and claim expenses incurred |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operational expenses |  |  |  |  |  |  |  |  | (18,359) | (14,344) | (6)
Corporate expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | (1,572) | (562) | (996)
Total expenses |  |  |  |  |  |  |  |  | (19,931) | (14,906) | (1,002)
(Loss) income before equity in net income of subsidiaries and taxes |  |  |  |  |  |  |  |  | (6,869) | (9,363) | (13,437)
Equity in net (loss) income of subsidiaries |  |  |  |  |  |  |  |  | 174,626 | (584,091) | (577,273)
(Loss) income before taxes |  |  |  |  |  |  |  |  | 167,757 | (593,454) | (590,710)
Income tax (expense) benefit |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net (loss) income |  |  |  |  |  |  |  |  | 167,757 | (593,454) | (590,710)
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net (loss) income attributable to RenaissanceRe |  |  |  |  |  |  |  |  | 167,757 | (593,454) | (590,710)
Dividends on preference shares |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net (loss) income (attributable) available to RenaissanceRe common shareholders |  |  |  |  |  |  |  |  | $ 167,757 | $ (593,454) | $ (590,710)

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- Definition The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, and for selling, general and administrative costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.5,6,7) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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