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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Gross premiums written $ 661,997 $ 511,540 $ 1,305,575 $ 1,216,800
Net premiums written 508,677 346,407 912,712 796,754
Net premiums earned 379,828 260,416 676,588 546,950
Net claims and claim expenses incurred 169,344 81,388 246,197 140,303
Acquisition expenses 61,666 33,477 105,067 67,177
Operational expenses 54,673 45,841 100,294 88,465
Underwriting income (loss) 94,145 99,710 225,030 251,005
Net investment income 38,604 34,541 78,311 73,489
Net foreign exchange (losses) gains (1,740) 2,392 (4,870) 1,331
Equity in earnings of other ventures 6,160 7,232 11,455 11,431
Other income (loss) 1,427 (535) 2,966 (473)
Net realized and unrealized (losses) gains on investments (26,712) 27,128 15,037 42,055
Corporate expenses (13,032) (3,954) (58,630) (8,499)
Interest expense (9,698) (4,292) (14,949) (8,585)
Income before taxes 89,154 162,222 254,350 361,754
Income tax (expense) benefit 1,842 204 49,746 38
Net income attributable to noncontrolling interests (12,167) (36,078) (51,829) (78,846)
Dividends on preference shares (5,596) (5,596) (11,191) (11,191)
Net income available to RenaissanceRe common shareholders 73,233 120,752 241,076 271,755
Net claims and claim expenses incurred – current accident year 202,420 98,471 301,418 174,079
Net claims and claim expenses incurred – prior accident years (33,076) (17,083) (55,221) (33,776)
Net claims and claim expenses incurred – total $ 169,344 $ 81,388 $ 246,197 $ 140,303
Net claims and claim expense ratio – current accident year 53.30% 37.80% 44.50% 31.80%
Net claims and claim expense ratio – prior accident years (8.70%) (6.50%) (8.10%) (6.10%)
Net claims and claim expense ratio – calendar year 44.60% 31.30% 36.40% 25.70%
Underwriting expense ratio 30.60% 30.40% 30.30% 28.40%
Combined ratio 75.20% 61.70% 66.70% 54.10%
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Gross premiums written     $ (100)  
Catastrophe Reinsurance        
Segment Reporting Information [Line Items]        
Gross premiums written $ 385,366 $ 388,083 774,613 $ 855,794
Net premiums written 270,490 233,698 493,130 493,187
Net premiums earned 162,705 159,152 306,472 323,736
Net claims and claim expenses incurred 55,376 36,730 62,970 43,185
Acquisition expenses 19,314 17,806 26,968 24,932
Operational expenses 22,090 22,200 42,453 42,619
Underwriting income (loss) 65,925 82,416 174,081 213,000
Net claims and claim expenses incurred – current accident year 67,334 38,473 91,458 51,002
Net claims and claim expenses incurred – prior accident years (11,958) (1,743) (28,488) (7,817)
Net claims and claim expenses incurred – total $ 55,376 $ 36,730 $ 62,970 $ 43,185
Net claims and claim expense ratio – current accident year 41.40% 24.20% 29.80% 15.80%
Net claims and claim expense ratio – prior accident years (7.40%) (1.10%) (9.30%) (2.50%)
Net claims and claim expense ratio – calendar year 34.00% 23.10% 20.50% 13.30%
Underwriting expense ratio 25.50% 25.10% 22.70% 20.90%
Combined ratio 59.50% 48.20% 43.20% 34.20%
Specialty Reinsurance        
Segment Reporting Information [Line Items]        
Gross premiums written $ 160,013 $ 51,554 $ 284,304 $ 205,844
Net premiums written 139,867 46,254 243,782 171,743
Net premiums earned 155,584 53,588 250,460 123,218
Net claims and claim expenses incurred 86,062 20,075 125,650 46,156
Acquisition expenses 28,251 11,699 48,940 28,246
Operational expenses 18,747 10,514 32,037 20,620
Underwriting income (loss) 22,524 11,300 43,833 28,196
Net claims and claim expenses incurred – current accident year 104,315 25,443 153,579 67,365
Net claims and claim expenses incurred – prior accident years (18,253) (5,368) (27,929) (21,209)
Net claims and claim expenses incurred – total $ 86,062 $ 20,075 $ 125,650 $ 46,156
Net claims and claim expense ratio – current accident year 67.00% 47.50% 61.30% 54.70%
Net claims and claim expense ratio – prior accident years (11.70%) (10.00%) (11.10%) (17.20%)
Net claims and claim expense ratio – calendar year 55.30% 37.50% 50.20% 37.50%
Underwriting expense ratio 30.20% 41.40% 32.30% 39.60%
Combined ratio 85.50% 78.90% 82.50% 77.10%
Lloyd's        
Segment Reporting Information [Line Items]        
Gross premiums written $ 116,618 $ 71,903 $ 246,748 $ 155,162
Net premiums written 98,320 66,452 175,889 131,821
Net premiums earned 61,539 47,672 119,745 99,969
Net claims and claim expenses incurred 27,683 25,111 57,526 51,392
Acquisition expenses 14,210 10,122 28,903 20,689
Operational expenses 13,719 13,058 25,659 25,091
Underwriting income (loss) 5,927 (619) 7,657 2,797
Net claims and claim expenses incurred – current accident year 30,771 34,555 56,381 55,712
Net claims and claim expenses incurred – prior accident years (3,088) (9,444) 1,145 (4,320)
Net claims and claim expenses incurred – total $ 27,683 $ 25,111 $ 57,526 $ 51,392
Net claims and claim expense ratio – current accident year 50.00% 72.50% 47.10% 55.70%
Net claims and claim expense ratio – prior accident years (5.00%) (19.80%) 0.90% (4.30%)
Net claims and claim expense ratio – calendar year 45.00% 52.70% 48.00% 51.40%
Underwriting expense ratio 45.40% 48.60% 45.60% 45.80%
Combined ratio 90.40% 101.30% 93.60% 97.20%
Other        
Segment Reporting Information [Line Items]        
Gross premiums written $ 0 $ 0 $ (90) $ 0
Net premiums written 0 3 (89) 3
Net premiums earned 0 4 (89) 27
Net claims and claim expenses incurred 223 (528) 51 (430)
Acquisition expenses (109) (6,150) 256 (6,690)
Operational expenses 117 69 145 135
Underwriting income (loss) (231) 6,613 (541) 7,012
Net investment income 38,604 34,541 78,311 73,489
Net foreign exchange (losses) gains (1,740) 2,392 (4,870) 1,331
Equity in earnings of other ventures 6,160 7,232 11,455 11,431
Other income (loss) 1,427 (535) 2,966 (473)
Net realized and unrealized (losses) gains on investments (26,712) 27,128 15,037 42,055
Corporate expenses (13,032) (3,954) (58,630) (8,499)
Interest expense (9,698) (4,292) (14,949) (8,585)
Income tax (expense) benefit 1,842 204 49,746 38
Net income attributable to noncontrolling interests (12,167) (36,078) (51,829) (78,846)
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 223 (528) 51 (430)
Net claims and claim expenses incurred – total $ 223 $ (528) $ 51 $ (430)
Net claims and claim expense ratio – current accident year 0.00% 0.00% 0.00% 0.00%
Net claims and claim expense ratio – prior accident years 0.00% (13200.00%) (57.30%) (1592.60%)
Net claims and claim expense ratio – calendar year 0.00% (13200.00%) (57.30%) (1592.60%)
Underwriting expense ratio 0.00% (152025.00%) (450.60%) (24277.80%)
Combined ratio 0.00% (165225.00%) (507.90%) (25870.40%)