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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%)

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