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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]                      
Gross premiums written $ 336,093 $ 369,642 $ 661,997 $ 643,578 $ 132,780 $ 200,992 $ 511,540 $ 705,260 $ 2,011,310 $ 1,550,572 $ 1,605,412
Net premiums written 236,651 266,820 508,677 404,035 111,769 159,713 346,407 450,347 1,416,183 1,068,236 1,203,947
Net premiums earned 361,575 362,388 379,828 296,760 256,487 258,979 260,416 286,534 1,400,551 1,062,416 1,114,626
Net claims and claim expenses incurred 102,013 100,028 169,344 76,853 (12,003) 69,647 81,388 58,915 448,238 197,947 171,287
Acquisition expenses 55,399 78,126 61,666 43,401 39,749 37,550 33,477 33,700 238,592 144,476 125,501
Operational expenses 64,300 54,518 54,673 45,621 55,202 46,972 45,841 42,624 219,112 190,639 191,105
Underwriting income (loss)                 494,609 529,354 626,733
Net investment income 45,918 28,338 38,604 39,707 25,886 24,941 34,541 38,948 152,567 124,316 208,028
Net foreign exchange (losses) gains 1,203 616 (1,740) (3,130) (107) 5,036 2,392 (1,061) (3,051) 6,260 1,917
Equity in earnings of other ventures 3,296 5,730 6,160 5,295 4,838 9,806 7,232 4,199 20,481 26,075 23,194
Other income (loss) 8,200 2,306 1,427 1,539 1,219 (1,169) (535) 62 13,472 (423) (2,359)
Net realized and unrealized (losses) gains on investments (42,817) (41,138) (26,712) 41,749 30,475 (31,097) 27,128 14,927 (68,918) 41,433 35,076
Corporate expenses (10,982) (7,502) (13,032) (45,598) (10,583) (3,905) (3,954) (4,545) (77,114) (22,987) (33,622)
Interest expense (10,359) (10,362) (9,698) (5,251) (4,289) (4,290) (4,292) (4,293) (35,670) (17,164) (17,929)
Income from continuing operations before taxes 134,322 107,704 89,154 165,196 220,978 104,132 162,222 199,532 496,376 686,864 841,038
Income tax benefit (expense) (8,453) 4,573 1,842 47,904 (401) (245) 204 (166) 45,866 (608) (1,692)
Income from discontinued operations                 0 0 2,422
Net income attributable to noncontrolling interests (28,068) (31,153) (12,167) (39,662) (44,215) (30,477) (36,078) (42,768) (111,050) (153,538) (151,144)
Dividends on preference shares (5,595) (5,595) (5,596) (5,595) (5,595) (5,595) (5,596) (5,595) (22,381) (22,381) (24,948)
Net income available to RenaissanceRe common shareholders $ 92,206 $ 75,529 $ 73,233 $ 167,843 $ 170,767 $ 67,815 $ 120,752 $ 151,003 408,811 510,337 665,676
Net claims and claim expenses incurred - current accident year                 610,685 341,745 315,241
Net claims and claim expenses incurred – prior accident years                 (162,447) (143,798) (143,954)
Total net incurred                 $ 448,238 $ 197,947 $ 171,287
Net claims and claim expense ratio - current accident year                 43.60% 32.20% 28.30%
Net claims and claim expense ratio - prior accident years                 (11.60%) (13.60%) (12.90%)
Net claims and claim expense ratio - calendar year                 32.00% 18.60% 15.40%
Underwriting expense ratio                 32.70% 31.60% 28.40%
Combined ratio                 64.70% 50.20% 43.80%
Intersegment Eliminations                      
Segment Reporting Information [Line Items]                      
Gross premiums written                 $ (100)    
Catastrophe Reinsurance                      
Segment Reporting Information [Line Items]                      
Gross premiums written                 868,631 $ 933,969 $ 1,120,379
Net premiums written                 557,369 541,608 753,078
Net premiums earned                 622,714 590,845 723,705
Net claims and claim expenses incurred                 75,574 1,757 7,908
Acquisition expenses                 47,264 43,161 49,161
Operational expenses                 93,494 95,851 108,130
Underwriting income (loss)                 406,382 450,076 558,506
Net claims and claim expenses incurred - current accident year                 145,951 67,268 109,945
Net claims and claim expenses incurred – prior accident years                 (70,377) (65,511) (102,037)
Total net incurred                 $ 75,574 $ 1,757 $ 7,908
Net claims and claim expense ratio - current accident year                 23.40% 11.40% 15.20%
Net claims and claim expense ratio - prior accident years                 (11.30%) (11.10%) (14.10%)
Net claims and claim expense ratio - calendar year                 12.10% 0.30% 1.10%
Underwriting expense ratio                 22.60% 23.50% 21.70%
Combined ratio                 34.70% 23.80% 22.80%
Specialty Reinsurance                      
Segment Reporting Information [Line Items]                      
Gross premiums written                 $ 766,051 $ 346,638 $ 259,489
Net premiums written                 582,909 295,855 248,562
Net premiums earned                 548,810 253,537 214,306
Net claims and claim expenses incurred                 244,495 88,502 67,236
Acquisition expenses                 135,811 60,936 41,538
Operational expenses                 70,525 43,370 31,780
Underwriting income (loss)                 97,979 60,729 73,752
Net claims and claim expenses incurred - current accident year                 336,407 144,411 101,347
Net claims and claim expenses incurred – prior accident years                 (91,912) (55,909) (34,111)
Total net incurred                 $ 244,495 $ 88,502 $ 67,236
Net claims and claim expense ratio - current accident year                 61.30% 57.00% 47.30%
Net claims and claim expense ratio - prior accident years                 (16.70%) (22.10%) (15.90%)
Net claims and claim expense ratio - calendar year                 44.60% 34.90% 31.40%
Underwriting expense ratio                 37.50% 41.10% 34.20%
Combined ratio                 82.10% 76.00% 65.60%
Lloyd's                      
Segment Reporting Information [Line Items]                      
Gross premiums written                 $ 376,718 $ 269,656 $ 226,532
Net premiums written                 275,953 230,429 201,697
Net premiums earned                 229,075 217,666 176,029
Net claims and claim expenses incurred                 128,667 113,825 95,693
Acquisition expenses                 55,269 46,927 34,823
Operational expenses                 54,827 51,115 50,540
Underwriting income (loss)                 (9,688) 5,799 (5,027)
Net claims and claim expenses incurred - current accident year                 128,327 130,066 103,949
Net claims and claim expenses incurred – prior accident years                 340 (16,241) (8,256)
Total net incurred                 $ 128,667 $ 113,825 $ 95,693
Net claims and claim expense ratio - current accident year                 56.00% 59.80% 59.10%
Net claims and claim expense ratio - prior accident years                 0.20% (7.50%) (4.70%)
Net claims and claim expense ratio - calendar year                 56.20% 52.30% 54.40%
Underwriting expense ratio                 48.00% 45.00% 48.50%
Combined ratio                 104.20% 97.30% 102.90%
Other                      
Segment Reporting Information [Line Items]                      
Gross premiums written                 $ (90) $ 309 $ (988)
Net premiums written                 (48) 344 610
Net premiums earned                 (48) 368 586
Net claims and claim expenses incurred                 (498) (6,137) 450
Acquisition expenses                 248 (6,548) (21)
Operational expenses                 266 303 655
Underwriting income (loss)                 (64) 12,750 (498)
Net investment income                 152,567 124,316 208,028
Net foreign exchange (losses) gains                 (3,051) 6,260 1,917
Equity in earnings of other ventures                 20,481 26,075 23,194
Other income (loss)                 13,472 (423) (2,359)
Net realized and unrealized (losses) gains on investments                 (68,918) 41,433 35,076
Corporate expenses                 (77,114) (22,987) (33,622)
Interest expense                 (35,670) (17,164) (17,929)
Income tax benefit (expense)                 45,866 (608) (1,692)
Income from discontinued operations                     2,422
Net income attributable to noncontrolling interests                 (111,050) (153,538) (151,144)
Dividends on preference shares                 (22,381) (22,381) (24,948)
Net claims and claim expenses incurred - current accident year                 0 0 0
Net claims and claim expenses incurred – prior accident years                 (498) (6,137) 450
Total net incurred                 $ (498) $ (6,137) $ 450