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Segment Reporting (Schedule Of Significant Components Of The Company's Revenues And Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Gross premiums written $ 827,415 $ 759,128 $ 1,749,505 $ 1,621,261
Net premiums written 555,745 519,916 1,099,881 1,031,591
Net premiums earned 382,265 351,402 748,310 705,008
Net claims and claim expenses incurred 142,587 167,750 335,668 294,355
Acquisition expenses 88,251 69,005 171,533 134,597
Operational expenses 41,766 51,073 89,049 107,308
Underwriting income (loss) 109,661 63,574 152,060 168,748
Net investment income 54,163 54,124 108,488 82,987
Net foreign exchange gains (losses) 3,109 (690) 11,274 (2,382)
Equity in earnings of other ventures (5,543) (6,022) (4,036) (7,633)
Other income 2,392 2,654 4,057 6,733
Net realized and unrealized gains on investments 58,113 69,772 101,486 131,425
Corporate expenses (4,636) (5,752) (9,922) (13,977)
Interest expense (10,091) (10,536) (20,617) (21,074)
Income before taxes 218,254 179,168 350,862 360,093
Income tax expense (3,904) (6,612) (4,238) (9,356)
Net income attributable to redeemable noncontrolling interests (37,612) (30,635) (71,939) (75,226)
Dividends on preference shares (5,596) (5,596) (11,191) (11,191)
Net income available to RenaissanceRe common shareholders 171,142 136,325 263,494 264,320
Net claims and claim expenses incurred – current accident year 187,691 197,005 351,766 325,214
Net claims and claim expenses incurred – prior accident years (45,104) (29,255) (16,098) (30,859)
Total net incurred $ 142,587 $ 167,750 $ 335,668 $ 294,355
Net claims and claim expense ratio – current accident year 49.10% 56.10% 47.00% 46.10%
Net claims and claim expense ratio – prior accident years (11.80%) (8.40%) (2.10%) (4.30%)
Net claims and claim expense ratio – calendar year 37.30% 47.70% 44.90% 41.80%
Underwriting expense ratio 34.00% 34.20% 34.80% 34.30%
Combined ratio 71.30% 81.90% 79.70% 76.10%
Other        
Segment Reporting Information [Line Items]        
Gross premiums written $ 0 $ 0 $ 0 $ 0
Net premiums written 0 0 0 0
Net premiums earned 2 0 0 0
Net claims and claim expenses incurred (227) 85 (555) 3
Acquisition expenses (1) 0 (1) 0
Operational expenses 1 21 12 81
Underwriting income (loss) 229 (106) 544 (84)
Net investment income 54,163 54,124 108,488 82,987
Net foreign exchange gains (losses) 3,109 (690) 11,274 (2,382)
Equity in earnings of other ventures (5,543) (6,022) (4,036) (7,633)
Other income 2,392 2,654 4,057 6,733
Net realized and unrealized gains on investments 58,113 69,772 101,486 131,425
Corporate expenses (4,636) (5,752) (9,922) (13,977)
Interest expense (10,091) (10,536) (20,617) (21,074)
Income tax expense (3,904) (6,612) (4,238) (9,356)
Net income attributable to redeemable noncontrolling interests (37,612) (30,635) (71,939) (75,226)
Dividends on preference shares (5,596) (5,596) (11,191) (11,191)
Net claims and claim expenses incurred – current accident year 0 0 0 0
Net claims and claim expenses incurred – prior accident years (227) 85 (555) 3
Total net incurred (227) 85 (555) 3
Property        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     (24,800) (18,989)
Property | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written 499,347 493,953 1,019,876 938,912
Net premiums written 336,464 350,593 626,335 583,452
Net premiums earned 192,198 191,060 379,186 366,292
Net claims and claim expenses incurred 33,017 80,275 71,855 102,079
Acquisition expenses 28,500 29,389 57,603 49,513
Operational expenses 24,053 26,526 51,718 55,183
Underwriting income (loss) 106,628 54,870 198,010 159,517
Net claims and claim expenses incurred – current accident year 56,889 93,336 96,655 121,068
Net claims and claim expenses incurred – prior accident years (23,872) (13,061) (24,800) (18,989)
Total net incurred $ 33,017 $ 80,275 $ 71,855 $ 102,079
Net claims and claim expense ratio – current accident year 29.60% 48.90% 25.50% 33.10%
Net claims and claim expense ratio – prior accident years (12.40%) (6.90%) (6.60%) (5.20%)
Net claims and claim expense ratio – calendar year 17.20% 42.00% 18.90% 27.90%
Underwriting expense ratio 27.30% 29.30% 28.90% 28.60%
Combined ratio 44.50% 71.30% 47.80% 56.50%
Casualty and Specialty        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     $ 9,257 $ (11,873)
Casualty and Specialty | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written $ 328,068 $ 265,175 729,629 682,349
Net premiums written 219,281 169,323 473,546 448,139
Net premiums earned 190,065 160,342 369,124 338,716
Net claims and claim expenses incurred 109,797 87,390 264,368 192,273
Acquisition expenses 59,752 39,616 113,931 85,084
Operational expenses 17,712 24,526 37,319 52,044
Underwriting income (loss) 2,804 8,810 (46,494) 9,315
Net claims and claim expenses incurred – current accident year 130,802 103,669 255,111 204,146
Net claims and claim expenses incurred – prior accident years (21,005) (16,279) 9,257 (11,873)
Total net incurred $ 109,797 $ 87,390 $ 264,368 $ 192,273
Net claims and claim expense ratio – current accident year 68.80% 64.70% 69.10% 60.30%
Net claims and claim expense ratio – prior accident years (11.00%) (10.20%) 2.50% (3.50%)
Net claims and claim expense ratio – calendar year 57.80% 54.50% 71.60% 56.80%
Underwriting expense ratio 40.70% 40.00% 41.00% 40.40%
Combined ratio 98.50% 94.50% 112.60% 97.20%