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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Segment Reporting Information [Line Items]        
Gross premiums written $ 1,476,908 $ 977,343 $ 3,041,203 $ 2,136,995
Net premiums written 1,022,965 604,509 1,951,996 1,267,553
Net premiums earned 911,502 429,385 1,461,530 869,667
Net claims and claim expenses incurred 453,373 60,167 680,408 231,870
Acquisition expenses 227,482 105,052 351,433 202,763
Operational expenses 59,814 37,543 104,747 78,815
Underwriting income (loss) 170,833 226,623 324,942 356,219
Net investment income 115,832 71,356 197,294 127,832
Net foreign exchange gains (losses) 9,309 (10,687) 6,463 (6,930)
Equity in earnings of other ventures 6,812 5,826 11,473 6,683
Other income (loss) 922 1,225 4,093 (17)
Net realized and unrealized gains (losses) on investments 194,003 (17,901) 364,648 (100,045)
Corporate expenses (23,847) (8,301) (62,636) (15,034)
Interest expense (15,534) (11,768) (27,288) (23,535)
Income before taxes 458,330 256,373 818,989 345,173
Income tax expense (9,475) (4,506) (17,006) (1,099)
Net income attributable to redeemable noncontrolling interests (71,812) (54,483) (142,034) (84,382)
Dividends on preference shares (9,189) (5,596) (18,378) (11,191)
Net income available to RenaissanceRe common shareholders 367,854 191,788 641,571 248,501
Net claims and claim expenses incurred – current accident year 453,140 216,396 684,481 419,434
Net claims and claim expenses incurred – prior accident years 233 (156,229) (4,073) (187,564)
Total net incurred $ 453,373 $ 60,167 $ 680,408 $ 231,870
Net claims and claim expense ratio – current accident year 49.70% 50.40% 46.80% 48.20%
Net claims and claim expense ratio – prior accident years 0.00% (36.40%) (0.20%) (21.50%)
Net claims and claim expense ratio – calendar year 49.70% 14.00% 46.60% 26.70%
Underwriting expense ratio 31.60% 33.20% 31.20% 32.30%
Combined ratio 81.30% 47.20% 77.80% 59.00%
Other        
Segment Reporting Information [Line Items]        
Gross premiums written $ 0 $ 0 $ 0 $ 0
Net premiums written 0 0 0 0
Net premiums earned 0 0 0 0
Net claims and claim expenses incurred (2) (88) 17 (70)
Acquisition expenses (192) 1 (192) 1
Operational expenses 34 181 34 314
Underwriting income (loss) 160 (94) 141 (245)
Net investment income 115,832 71,356 197,294 127,832
Net foreign exchange gains (losses) 9,309 (10,687) 6,463 (6,930)
Equity in earnings of other ventures 6,812 5,826 11,473 6,683
Other income (loss) 922 1,225 4,093 (17)
Net realized and unrealized gains (losses) on investments 194,003 (17,901) 364,648 (100,045)
Corporate expenses (23,847) (8,301) (62,636) (15,034)
Interest expense (15,534) (11,768) (27,288) (23,535)
Income tax expense (9,475) (4,506) (17,006) (1,099)
Net income attributable to redeemable noncontrolling interests (71,812) (54,483) (142,034) (84,382)
Dividends on preference shares (9,189) (5,596) (18,378) (11,191)
Net claims and claim expenses incurred – current accident year 0 0 0 0
Net claims and claim expenses incurred – prior accident years (2) (88) 17 (70)
Total net incurred (2) (88) 17 (70)
Property        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     12,640 (170,707)
Property | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written 839,200 552,627 1,871,584 1,259,595
Net premiums written 544,115 297,832 1,108,345 651,909
Net premiums earned 425,013 204,138 715,758 429,187
Net claims and claim expenses incurred 146,874 (74,269) 202,957 (43,662)
Acquisition expenses 89,711 40,850 143,450 81,571
Operational expenses 36,764 23,810 65,308 50,356
Underwriting income (loss) 151,664 213,747 304,043 340,922
Net claims and claim expenses incurred – current accident year 136,111 68,876 190,317 127,045
Net claims and claim expenses incurred – prior accident years 10,763 (143,145) 12,640 (170,707)
Total net incurred $ 146,874 $ (74,269) $ 202,957 $ (43,662)
Net claims and claim expense ratio – current accident year 32.00% 33.70% 26.60% 29.60%
Net claims and claim expense ratio – prior accident years 2.60% (70.10%) 1.80% (39.80%)
Net claims and claim expense ratio – calendar year 34.60% (36.40%) 28.40% (10.20%)
Underwriting expense ratio 29.70% 31.70% 29.10% 30.80%
Combined ratio 64.30% (4.70%) 57.50% 20.60%
Casualty and Specialty        
Segment Reporting Information [Line Items]        
Net claims and claim expenses incurred – prior accident years     $ (16,730) $ (16,787)
Casualty and Specialty | Operating Segments        
Segment Reporting Information [Line Items]        
Gross premiums written $ 637,708 $ 424,716 1,169,619 877,400
Net premiums written 478,850 306,677 843,651 615,644
Net premiums earned 486,489 225,247 745,772 440,480
Net claims and claim expenses incurred 306,501 134,524 477,434 275,602
Acquisition expenses 137,963 64,201 208,175 121,191
Operational expenses 23,016 13,552 39,405 28,145
Underwriting income (loss) 19,009 12,970 20,758 15,542
Net claims and claim expenses incurred – current accident year 317,029 147,520 494,164 292,389
Net claims and claim expenses incurred – prior accident years (10,528) (12,996) (16,730) (16,787)
Total net incurred $ 306,501 $ 134,524 $ 477,434 $ 275,602
Net claims and claim expense ratio – current accident year 65.20% 65.50% 66.30% 66.40%
Net claims and claim expense ratio – prior accident years (2.20%) (5.80%) (2.30%) (3.80%)
Net claims and claim expense ratio – calendar year 63.00% 59.70% 64.00% 62.60%
Underwriting expense ratio 33.10% 34.50% 33.20% 33.90%
Combined ratio 96.10% 94.20% 97.20% 96.50%