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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Gross premiums written $ 625,677 $ 640,269 $ 2,762,672 $ 2,389,774
Net premiums written 453,255 483,221 1,720,808 1,583,102
Net premiums earned 531,849 547,792 1,401,516 1,296,102
Net claims and claim expenses incurred 410,510 1,221,696 642,380 1,557,364
Acquisition expenses 109,761 76,761 312,524 248,294
Operational expenses 40,593 42,537 119,408 131,586
Underwriting income (loss) (29,015) (793,202) 327,204 (641,142)
Net investment income 80,696 40,257 208,528 148,745
Net foreign exchange (losses) gains (4,566) (156) (11,496) 11,118
Equity in earnings of other ventures 7,648 1,794 14,331 5,830
Other income 497 2,996 480 7,053
Net realized and unrealized gains (losses) on investments 13,630 42,052 (86,415) 143,538
Corporate expenses (6,841) (4,413) (21,875) (14,335)
Interest expense (11,769) (11,799) (35,304) (32,416)
Income (loss) before taxes 50,280 (722,471) 395,453 (371,609)
Income tax (expense) benefit (1,451) 18,977 (2,550) 14,739
Net (income) loss attributable to redeemable noncontrolling interests (6,440) 204,277 (90,822) 132,338
Dividends on preference shares (9,708) (5,595) (20,899) (16,786)
Net income (loss) available (attributable) to RenaissanceRe common shareholders 32,681 (504,812) 281,182 (241,318)
Net claims and claim expenses incurred – current accident year 419,926 1,209,261 839,360 1,561,027
Net claims and claim expenses incurred – prior accident years (9,416) 12,435 (196,980) (3,663)
Total net incurred $ 410,510 $ 1,221,696 $ 642,380 $ 1,557,364
Net claims and claim expense ratio – current accident year 79.00% 220.80% 59.90% 120.40%
Net claims and claim expense ratio – prior accident years (1.80%) 2.20% (14.10%) (0.20%)
Net claims and claim expense ratio – calendar year 77.20% 223.00% 45.80% 120.20%
Underwriting expense ratio 28.30% 21.80% 30.90% 29.30%
Combined ratio 105.50% 244.80% 76.70% 149.50%
Other        
Segment Reporting Information [Line Items]        
Gross premiums written $ 0 $ (7) $ 0 $ (7)
Net premiums written 0 (7) 0 (7)
Net premiums earned (1) (7) (1) (7)
Net claims and claim expenses incurred (18) (155) (88) (710)
Acquisition expenses (1) (1) 0 (2)
Operational expenses 40 25 354 37
Underwriting income (loss) (22) 124 (267) 668
Net investment income 80,696 40,257 208,528 148,745
Net foreign exchange (losses) gains (4,566) (156) (11,496) 11,118
Equity in earnings of other ventures 7,648 1,794 14,331 5,830
Other income 497 2,996 480 7,053
Net realized and unrealized gains (losses) on investments 13,630 42,052 (86,415) 143,538
Corporate expenses (6,841) (4,413) (21,875) (14,335)
Interest expense (11,769) (11,799) (35,304) (32,416)
Income tax (expense) benefit (1,451) 18,977 (2,550) 14,739
Net (income) loss attributable to redeemable noncontrolling interests (6,440) 204,277 (90,822) 132,338
Dividends on preference shares (9,708) (5,595) (20,899) (16,786)
Net claims and claim expenses incurred – current accident year 0 0 0 0
Net claims and claim expenses incurred – prior accident years (18) (155) (88) (710)
Total net incurred (18) (155) (88) (710)
Property        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     (172,872) (16,968)
Property | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written 301,413 325,395 1,561,008 1,345,271
Net premiums written 232,632 269,393 884,541 895,728
Net premiums earned 293,059 336,838 722,246 716,024
Net claims and claim expenses incurred 265,857 1,044,418 222,195 1,116,273
Acquisition expenses 45,524 17,514 127,095 75,117
Operational expenses 25,577 25,123 75,933 76,841
Underwriting income (loss) (43,899) (750,217) 297,023 (552,207)
Net claims and claim expenses incurred – current accident year 268,022 1,036,586 395,067 1,133,241
Net claims and claim expenses incurred – prior accident years (2,165) 7,832 (172,872) (16,968)
Total net incurred $ 265,857 $ 1,044,418 $ 222,195 $ 1,116,273
Net claims and claim expense ratio – current accident year 91.50% 307.70% 54.70% 158.30%
Net claims and claim expense ratio – prior accident years (0.80%) 2.40% (23.90%) (2.40%)
Net claims and claim expense ratio – calendar year 90.70% 310.10% 30.80% 155.90%
Underwriting expense ratio 24.30% 12.60% 28.10% 21.20%
Combined ratio 115.00% 322.70% 58.90% 177.10%
Casualty and Specialty        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     $ (24,020) $ 14,015
Casualty and Specialty | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written $ 324,264 $ 314,881 1,201,664 1,044,510
Net premiums written 220,623 213,835 836,267 687,381
Net premiums earned 238,791 210,961 679,271 580,085
Net claims and claim expenses incurred 144,671 177,433 420,273 441,801
Acquisition expenses 64,238 59,248 185,429 173,179
Operational expenses 14,976 17,389 43,121 54,708
Underwriting income (loss) 14,906 (43,109) 30,448 (89,603)
Net claims and claim expenses incurred – current accident year 151,904 172,675 444,293 427,786
Net claims and claim expenses incurred – prior accident years (7,233) 4,758 (24,020) 14,015
Total net incurred $ 144,671 $ 177,433 $ 420,273 $ 441,801
Net claims and claim expense ratio – current accident year 63.60% 81.90% 65.40% 73.70%
Net claims and claim expense ratio – prior accident years (3.00%) 2.20% (3.50%) 2.50%
Net claims and claim expense ratio – calendar year 60.60% 84.10% 61.90% 76.20%
Underwriting expense ratio 33.20% 36.30% 33.60% 39.20%
Combined ratio 93.80% 120.40% 95.50% 115.40%