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Segment Reporting (Schedule of Significant Components of the Company's Revenues and Expenses) (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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written | $ 547,755 | $ 625,677 | $ 977,343 | $ 1,159,652 | $ 407,766 | $ 640,269 | $ 827,415 | $ 922,090 | $ 3,310,427 | $ 2,797,540 | $ 2,374,576
Net premiums written | 411,094 | 453,255 | 604,509 | 663,044 | 288,223 | 483,221 | 555,745 | 544,136 | 2,131,902 | 1,871,325 | 1,535,312
Net premiums earned | 574,613 | 531,849 | 429,385 | 440,282 | 421,473 | 547,792 | 382,265 | 366,045 | 1,976,129 | 1,717,575 | 1,403,430
Net claims and claim expenses incurred | 477,638 | 410,510 | 60,167 | 171,703 | 304,064 | 1,221,696 | 142,587 | 193,081 | 1,120,018 | 1,861,428 | 530,831
Acquisition expenses | 120,465 | 109,761 | 105,052 | 97,711 | 98,598 | 76,761 | 88,251 | 83,282 | 432,989 | 346,892 | 289,323
Operational expenses | 58,859 | 40,593 | 37,543 | 41,272 | 29,192 | 42,537 | 41,766 | 47,283 | 178,267 | 160,778 | 197,749
Underwriting income (loss) |  |  |  |  |  |  |  |  | 244,855 | (651,523) | 385,527
Net investment income | 53,338 | 80,696 | 71,356 | 56,476 | 73,464 | 40,257 | 54,163 | 54,325 | 261,866 | 222,209 | 181,726
Net foreign exchange (losses) gains | (932) | (4,566) | (10,687) | 3,757 | (490) | (156) | 3,109 | 8,165 | (12,428) | 10,628 | (13,788)
Equity in earnings (losses) of other ventures | 4,143 | 7,648 | 5,826 | 857 | 2,200 | 1,794 | 5,543 | (1,507) | 18,474 | 8,030 | 963
Other income | 5,489 | 497 | 1,225 | (1,242) | 2,362 | 2,996 | 2,392 | 1,665 | 5,969 | 9,415 | 14,178
Net realized and unrealized (losses) gains on investments | (88,654) | 13,630 | (17,901) | (82,144) | (7,716) | 42,052 | 58,113 | 43,373 | (175,069) | 135,822 | 141,328
Corporate expenses | (12,108) | (6,841) | (8,301) | (6,733) | (4,237) | (4,413) | (4,636) | (5,286) | (33,983) | (18,572) | (37,402)
Interest expense | (11,765) | (11,769) | (11,768) | (11,767) | (11,777) | (11,799) | (10,091) | (10,526) | (47,069) | (44,193) | (42,144)
Income (loss) before taxes | (132,838) | 50,280 | 256,373 | 88,800 | 43,425 | (722,471) | 218,254 | 132,608 | 262,615 | (328,184) | 630,388
Income tax benefit (expense) | 8,852 | (1,451) | (4,506) | 3,407 | (41,226) | 18,977 | (3,904) | (334) | 6,302 | (26,487) | (340)
Net (income) loss attributable to redeemable noncontrolling interests | 49,269 | (6,440) | (54,483) | (29,899) | (56) | 204,277 | (37,612) | (34,327) | (41,553) | 132,282 | (127,086)
Dividends on preference shares | (9,189) | (9,708) | (5,596) | (5,595) | (5,595) | (5,595) | (5,596) | (5,595) | (30,088) | (22,381) | (22,381)
Net income (loss) available (attributable) to RenaissanceRe common shareholders | $ (83,906) | $ 32,681 | $ 191,788 | $ 56,713 | $ (3,452) | $ (504,812) | $ 171,142 | $ 92,352 | 197,276 | (244,770) | 480,581
Net claims and claim expenses incurred – current accident year |  |  |  |  |  |  |  |  | 1,390,767 | 1,902,424 | 694,957
Net claims and claim expenses incurred – prior accident years |  |  |  |  |  |  |  |  | (270,749) | (40,996) | (164,126)
Total net incurred |  |  |  |  |  |  |  |  | $ 1,120,018 | $ 1,861,428 | $ 530,831
Net claims and claim expense ratio – current accident year |  |  |  |  |  |  |  |  | 70.40% | 110.80% | 49.50%
Net claims and claim expense ratio – prior accident years |  |  |  |  |  |  |  |  | (13.70%) | (2.40%) | (11.70%)
Net claims and claim expense ratio – calendar year |  |  |  |  |  |  |  |  | 56.70% | 108.40% | 37.80%
Underwriting expense ratio |  |  |  |  |  |  |  |  | 30.90% | 29.50% | 34.70%
Combined ratio |  |  |  |  |  |  |  |  | 87.60% | 137.90% | 72.50%
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 0 | $ (7) | $ 0
Net premiums written |  |  |  |  |  |  |  |  | 0 | 4 | 143
Net premiums earned |  |  |  |  |  |  |  |  | 0 | 4 | 142
Net claims and claim expenses incurred |  |  |  |  |  |  |  |  | (197) | (1,583) | (1,110)
Acquisition expenses |  |  |  |  |  |  |  |  | (2) | (1) | 0
Operational expenses |  |  |  |  |  |  |  |  | 430 | 36 | 123
Underwriting income (loss) |  |  |  |  |  |  |  |  | (231) | 1,552 | 1,129
Net investment income |  |  |  |  |  |  |  |  | 261,866 | 222,209 | 181,726
Net foreign exchange (losses) gains |  |  |  |  |  |  |  |  | (12,428) | 10,628 | (13,788)
Equity in earnings (losses) of other ventures |  |  |  |  |  |  |  |  | 18,474 | 8,030 | 963
Other income |  |  |  |  |  |  |  |  | 5,969 | 9,415 | 14,178
Net realized and unrealized (losses) gains on investments |  |  |  |  |  |  |  |  | (175,069) | 135,822 | 141,328
Corporate expenses |  |  |  |  |  |  |  |  | (33,983) | (18,572) | (37,402)
Interest expense |  |  |  |  |  |  |  |  | (47,069) | (44,193) | (42,144)
Income tax benefit (expense) |  |  |  |  |  |  |  |  | 6,302 | (26,487) | (340)
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | (41,553) | 132,282 | (127,086)
Dividends on preference shares |  |  |  |  |  |  |  |  | (30,088) | (22,381) | (22,381)
Net claims and claim expenses incurred – current accident year |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net claims and claim expenses incurred – prior accident years |  |  |  |  |  |  |  |  | (197) | (1,583) | (1,110)
Total net incurred |  |  |  |  |  |  |  |  | (197) | (1,583) | (1,110)
Property |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | 1,760,926 | 1,440,437 | 1,111,263
Net claims and claim expenses incurred – prior accident years |  |  |  |  |  |  |  |  | (221,290) | (45,596) | (104,876)
Property | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | 1,760,926 | 1,440,437 | 1,111,263
Net premiums written |  |  |  |  |  |  |  |  | 1,055,188 | 978,014 | 725,321
Net premiums earned |  |  |  |  |  |  |  |  | 1,050,831 | 931,070 | 720,951
Net claims and claim expenses incurred |  |  |  |  |  |  |  |  | 497,895 | 1,297,985 | 151,545
Acquisition expenses |  |  |  |  |  |  |  |  | 177,912 | 113,816 | 97,594
Operational expenses |  |  |  |  |  |  |  |  | 112,954 | 94,194 | 108,642
Underwriting income (loss) |  |  |  |  |  |  |  |  | 262,070 | (574,925) | 363,170
Net claims and claim expenses incurred – current accident year |  |  |  |  |  |  |  |  | 719,185 | 1,343,581 | 256,421
Net claims and claim expenses incurred – prior accident years |  |  |  |  |  |  |  |  | (221,290) | (45,596) | (104,876)
Total net incurred |  |  |  |  |  |  |  |  | $ 497,895 | $ 1,297,985 | $ 151,545
Net claims and claim expense ratio – current accident year |  |  |  |  |  |  |  |  | 68.40% | 144.30% | 35.60%
Net claims and claim expense ratio – prior accident years |  |  |  |  |  |  |  |  | (21.00%) | (4.90%) | (14.60%)
Net claims and claim expense ratio – calendar year |  |  |  |  |  |  |  |  | 47.40% | 139.40% | 21.00%
Underwriting expense ratio |  |  |  |  |  |  |  |  | 27.70% | 22.30% | 28.60%
Combined ratio |  |  |  |  |  |  |  |  | 75.10% | 161.70% | 49.60%
Casualty and Specialty |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 1,549,501 | $ 1,357,110 | $ 1,263,313
Net claims and claim expenses incurred – prior accident years |  |  |  |  |  |  |  |  | (49,262) | 6,183 | (58,140)
Casualty and Specialty | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | 1,549,501 | 1,357,110 | 1,263,313
Net premiums written |  |  |  |  |  |  |  |  | 1,076,714 | 893,307 | 809,848
Net premiums earned |  |  |  |  |  |  |  |  | 925,298 | 786,501 | 682,337
Net claims and claim expenses incurred |  |  |  |  |  |  |  |  | 622,320 | 565,026 | 380,396
Acquisition expenses |  |  |  |  |  |  |  |  | 255,079 | 233,077 | 191,729
Operational expenses |  |  |  |  |  |  |  |  | 64,883 | 66,548 | 88,984
Underwriting income (loss) |  |  |  |  |  |  |  |  | (16,984) | (78,150) | 21,228
Net claims and claim expenses incurred – current accident year |  |  |  |  |  |  |  |  | 671,582 | 558,843 | 438,536
Net claims and claim expenses incurred – prior accident years |  |  |  |  |  |  |  |  | (49,262) | 6,183 | (58,140)
Total net incurred |  |  |  |  |  |  |  |  | $ 622,320 | $ 565,026 | $ 380,396
Net claims and claim expense ratio – current accident year |  |  |  |  |  |  |  |  | 72.60% | 71.10% | 64.30%
Net claims and claim expense ratio – prior accident years |  |  |  |  |  |  |  |  | (5.30%) | 0.70% | (8.60%)
Net claims and claim expense ratio – calendar year |  |  |  |  |  |  |  |  | 67.30% | 71.80% | 55.70%
Underwriting expense ratio |  |  |  |  |  |  |  |  | 34.50% | 38.10% | 41.20%
Combined ratio |  |  |  |  |  |  |  |  | 101.80% | 109.90% | 96.90%

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