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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Gross premiums written $ 640,269 $ 430,224 $ 2,389,774 $ 2,051,485
Net premiums written 483,221 284,222 1,583,102 1,315,813
Net premiums earned 547,792 346,521 1,296,102 1,051,529
Net claims and claim expenses incurred 1,221,696 112,575 1,557,364 406,930
Acquisition expenses 76,761 80,580 248,294 215,177
Operational expenses 42,537 40,493 131,586 147,801
Underwriting (loss) income (793,202) 112,873 (641,142) 281,621
Net investment income 40,257 51,423 148,745 134,410
Net foreign exchange (losses) gains (156) (5,986) 11,118 (8,368)
Equity in earnings (losses) of other ventures 1,794 (11,630) 5,830 (3,997)
Other income 2,996 2,268 7,053 9,001
Net realized and unrealized gains on investments 42,052 59,870 143,538 191,295
Corporate expenses (4,413) (11,537) (14,335) (25,514)
Interest expense (11,799) (10,536) (32,416) (31,610)
(Loss) income before taxes (722,471) 186,745 (371,609) 546,838
Income tax benefit (expense) 18,977 1,316 14,739 (8,040)
Net loss (income) attributable to redeemable noncontrolling interests 204,277 (35,641) 132,338 (110,867)
Dividends on preference shares (5,595) (5,595) (16,786) (16,786)
Net (loss) income (attributable) available to RenaissanceRe common shareholders (504,812) 146,825 (241,318) 411,145
Net claims and claim expenses incurred – current accident year 1,209,261 158,360 1,561,027 483,574
Net claims and claim expenses incurred – prior accident years 12,435 (45,785) (3,663) (76,644)
Total net incurred $ 1,221,696 $ 112,575 $ 1,557,364 $ 406,930
Net claims and claim expense ratio – current accident year 220.80% 45.70% 120.40% 46.00%
Net claims and claim expense ratio – prior accident years 2.20% (13.20%) (0.20%) (7.30%)
Net claims and claim expense ratio – calendar year 223.00% 32.50% 120.20% 38.70%
Underwriting expense ratio 21.80% 34.90% 29.30% 34.50%
Combined ratio 244.80% 67.40% 149.50% 73.20%
Other        
Segment Reporting Information [Line Items]        
Gross premiums written $ (7) $ 0 $ (7) $ 0
Net premiums written (7) 0 (7) 0
Net premiums earned (7) 0 (7) 0
Net claims and claim expenses incurred (155) (808) (710) (805)
Acquisition expenses (1) 0 (2) 0
Operational expenses 25 18 37 99
Underwriting (loss) income 124 790 668 706
Net investment income 40,257 51,423 148,745 134,410
Net foreign exchange (losses) gains (156) (5,986) 11,118 (8,368)
Equity in earnings (losses) of other ventures 1,794 (11,630) 5,830 (3,997)
Other income 2,996 2,268 7,053 9,001
Net realized and unrealized gains on investments 42,052 59,870 143,538 191,295
Corporate expenses (4,413) (11,537) (14,335) (25,514)
Interest expense (11,799) (10,536) (32,416) (31,610)
Income tax benefit (expense) 18,977 1,316 14,739 (8,040)
Net loss (income) attributable to redeemable noncontrolling interests 204,277 (35,641) 132,338 (110,867)
Dividends on preference shares (5,595) (5,595) (16,786) (16,786)
Net claims and claim expenses incurred – current accident year 0 0 0 0
Net claims and claim expenses incurred – prior accident years (155) (808) (710) (805)
Total net incurred (155) (808) (710) (805)
Property        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     (16,968) (37,512)
Property | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written 325,395 119,904 1,345,271 1,058,816
Net premiums written 269,393 90,909 895,728 674,361
Net premiums earned 336,838 172,661 716,024 538,953
Net claims and claim expenses incurred 1,044,418 23,539 1,116,273 125,618
Acquisition expenses 17,514 21,663 75,117 71,176
Operational expenses 25,123 24,258 76,841 79,441
Underwriting (loss) income (750,217) 103,201 (552,207) 262,718
Net claims and claim expenses incurred – current accident year 1,036,586 42,062 1,133,241 163,130
Net claims and claim expenses incurred – prior accident years 7,832 (18,523) (16,968) (37,512)
Total net incurred $ 1,044,418 $ 23,539 $ 1,116,273 $ 125,618
Net claims and claim expense ratio – current accident year 307.70% 24.40% 158.30% 30.30%
Net claims and claim expense ratio – prior accident years 2.40% (10.80%) (2.40%) (7.00%)
Net claims and claim expense ratio – calendar year 310.10% 13.60% 155.90% 23.30%
Underwriting expense ratio 12.60% 26.60% 21.20% 28.00%
Combined ratio 322.70% 40.20% 177.10% 51.30%
Casualty and Specialty        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     $ 14,015 $ (38,327)
Casualty and Specialty | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written $ 314,881 $ 310,320 1,044,510 992,669
Net premiums written 213,835 193,313 687,381 641,452
Net premiums earned 210,961 173,860 580,085 512,576
Net claims and claim expenses incurred 177,433 89,844 441,801 282,117
Acquisition expenses 59,248 58,917 173,179 144,001
Operational expenses 17,389 16,217 54,708 68,261
Underwriting (loss) income (43,109) 8,882 (89,603) 18,197
Net claims and claim expenses incurred – current accident year 172,675 116,298 427,786 320,444
Net claims and claim expenses incurred – prior accident years 4,758 (26,454) 14,015 (38,327)
Total net incurred $ 177,433 $ 89,844 $ 441,801 $ 282,117
Net claims and claim expense ratio – current accident year 81.90% 66.90% 73.70% 62.50%
Net claims and claim expense ratio – prior accident years 2.20% (15.20%) 2.50% (7.50%)
Net claims and claim expense ratio – calendar year 84.10% 51.70% 76.20% 55.00%
Underwriting expense ratio 36.30% 43.20% 39.20% 41.40%
Combined ratio 120.40% 94.90% 115.40% 96.40%