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Segment Reporting (Schedule of Significant Components of the Company's Revenues and Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]        
Gross premiums written $ 861,068 $ 625,677 $ 3,902,271 $ 2,762,672
Net premiums written 704,130 453,255 2,656,126 1,720,808
Net premiums earned 906,748 531,849 2,368,278 1,401,516
Net claims and claim expenses incurred 654,520 410,510 1,334,928 642,380
Acquisition expenses 202,181 109,761 553,614 312,524
Operational expenses 53,415 40,593 158,162 119,408
Underwriting income (loss) (3,368) (29,015) 321,574 327,204
Net investment income 113,844 80,696 311,138 208,528
Net foreign exchange losses (8,275) (4,566) (1,812) (11,496)
Equity in earnings of other ventures 5,877 7,648 17,350 14,331
Other income 1,016 497 5,109 480
Net realized and unrealized gains (losses) on investments 31,938 13,630 396,586 (86,415)
Corporate expenses (13,844) (6,841) (76,480) (21,875)
Interest expense (15,580) (11,769) (42,868) (35,304)
Income before taxes 111,608 50,280 930,597 395,453
Income tax expense (3,664) (1,451) (20,670) (2,550)
Net income attributable to redeemable noncontrolling interests (62,057) (6,440) (204,091) (90,822)
Dividends on preference shares (9,189) (9,708) (27,567) (20,899)
Net income available to RenaissanceRe common shareholders 36,698 32,681 678,269 281,182
Net claims and claim expenses incurred – current accident year 664,967 419,926 1,349,448 839,360
Net claims and claim expenses incurred – prior accident years (10,447) (9,416) (14,520) (196,980)
Total net incurred $ 654,520 $ 410,510 $ 1,334,928 $ 642,380
Net claims and claim expense ratio – current accident year 73.30% 79.00% 57.00% 59.90%
Net claims and claim expense ratio – prior accident years (1.10%) (1.80%) (0.60%) (14.10%)
Net claims and claim expense ratio – calendar year 72.20% 77.20% 56.40% 45.80%
Underwriting expense ratio 28.20% 28.30% 30.00% 30.90%
Combined ratio 100.40% 105.50% 86.40% 76.70%
Other        
Segment Reporting Information [Line Items]        
Gross premiums written $ 0 $ 0 $ 0 $ 0
Net premiums written 0 0 0 0
Net premiums earned 0 (1) 0 (1)
Net claims and claim expenses incurred 161 (18) 178 (88)
Acquisition expenses 6 (1) (186) 0
Operational expenses (21) 40 13 354
Underwriting income (loss) (146) (22) (5) (267)
Net investment income 113,844 80,696 311,138 208,528
Net foreign exchange losses (8,275) (4,566) (1,812) (11,496)
Equity in earnings of other ventures 5,877 7,648 17,350 14,331
Other income 1,016 497 5,109 480
Net realized and unrealized gains (losses) on investments 31,938 13,630 396,586 (86,415)
Corporate expenses (13,844) (6,841) (76,480) (21,875)
Interest expense (15,580) (11,769) (42,868) (35,304)
Income tax expense (3,664) (1,451) (20,670) (2,550)
Net income attributable to redeemable noncontrolling interests (62,057) (6,440) (204,091) (90,822)
Dividends on preference shares (9,189) (9,708) (27,567) (20,899)
Net claims and claim expenses incurred – current accident year 0 0 0 0
Net claims and claim expenses incurred – prior accident years 161 (18) 178 (88)
Total net incurred 161 (18) 178 (88)
Property        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     5,020 (172,872)
Property | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written 314,400 301,413 2,185,984 1,561,008
Net premiums written 302,982 232,632 1,411,327 884,541
Net premiums earned 444,332 293,059 1,160,090 722,246
Net claims and claim expenses incurred 338,260 265,857 541,217 222,195
Acquisition expenses 79,521 45,524 222,971 127,095
Operational expenses 34,238 25,577 99,546 75,933
Underwriting income (loss) (7,687) (43,899) 296,356 297,023
Net claims and claim expenses incurred – current accident year 345,880 268,022 536,197 395,067
Net claims and claim expenses incurred – prior accident years (7,620) (2,165) 5,020 (172,872)
Total net incurred $ 338,260 $ 265,857 $ 541,217 $ 222,195
Net claims and claim expense ratio – current accident year 77.80% 91.50% 46.20% 54.70%
Net claims and claim expense ratio – prior accident years (1.70%) (0.80%) 0.50% (23.90%)
Net claims and claim expense ratio – calendar year 76.10% 90.70% 46.70% 30.80%
Underwriting expense ratio 25.60% 24.30% 27.80% 28.10%
Combined ratio 101.70% 115.00% 74.50% 58.90%
Casualty and Specialty        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     $ (19,718) $ (24,020)
Casualty and Specialty | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written $ 546,668 $ 324,264 1,716,287 1,201,664
Net premiums written 401,148 220,623 1,244,799 836,267
Net premiums earned 462,416 238,791 1,208,188 679,271
Net claims and claim expenses incurred 316,099 144,671 793,533 420,273
Acquisition expenses 122,654 64,238 330,829 185,429
Operational expenses 19,198 14,976 58,603 43,121
Underwriting income (loss) 4,465 14,906 25,223 30,448
Net claims and claim expenses incurred – current accident year 319,087 151,904 813,251 444,293
Net claims and claim expenses incurred – prior accident years (2,988) (7,233) (19,718) (24,020)
Total net incurred $ 316,099 $ 144,671 $ 793,533 $ 420,273
Net claims and claim expense ratio – current accident year 69.00% 63.60% 67.30% 65.40%
Net claims and claim expense ratio – prior accident years (0.60%) (3.00%) (1.60%) (3.50%)
Net claims and claim expense ratio – calendar year 68.40% 60.60% 65.70% 61.90%
Underwriting expense ratio 30.60% 33.20% 32.20% 33.60%
Combined ratio 99.00% 93.80% 97.90% 95.50%