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Segment Reporting (Schedule Of Significant Components Of The Company's Revenues And Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | $ 430,224 | $ 369,642 | $ 2,051,485 | $ 1,675,217
Net premiums written | 284,222 | 266,820 | 1,315,813 | 1,179,532
Net premiums earned | 346,521 | 362,388 | 1,051,529 | 1,038,976
Net claims and claim expenses incurred | 112,575 | 100,028 | 406,930 | 346,225
Acquisition expenses | 80,580 | 78,126 | 215,177 | 183,193
Operational expenses | 40,493 | 54,518 | 147,801 | 154,812
Underwriting income (loss) | 112,873 | 129,716 | 281,621 | 354,746
Net investment income | 51,423 | 28,338 | 134,410 | 106,649
Net foreign exchange (losses) gains | (5,986) | 616 | (8,368) | (4,254)
Equity in (losses) earnings of other ventures | (11,630) | 5,730 | (3,997) | 17,185
Other income | 2,268 | 2,306 | 9,001 | 5,272
Net realized and unrealized gains (losses) on investments | 59,870 | (41,138) | 191,295 | (26,101)
Corporate expenses | (11,537) | (7,322) | (25,514) | (65,723)
Interest expense | (10,536) | (10,542) | (31,610) | (25,720)
Income before taxes | 186,745 | 107,704 | 546,838 | 362,054
Income tax benefit (expense) | 1,316 | 4,573 | (8,040) | 54,319
Net income attributable to redeemable noncontrolling interests | (35,641) | (31,153) | (110,867) | (82,982)
Dividends on preference shares | (5,595) | (5,595) | (16,786) | (16,786)
Net income available to RenaissanceRe common shareholders | 146,825 | 75,529 | 411,145 | 316,605
Net claims and claim expenses incurred – current accident year | 158,360 | 170,378 | 483,574 | 471,796
Net claims and claim expenses incurred – prior accident years | (45,785) | (70,350) | (76,644) | (125,571)
Net claims and claim expenses incurred – total | $ 112,575 | $ 100,028 | $ 406,930 | $ 346,225
Net claims and claim expense ratio – current accident year | 45.70% | 47.00% | 46.00% | 45.40%
Net claims and claim expense ratio – prior accident years | (13.20%) | (19.40%) | (7.30%) | (12.10%)
Net claims and claim expense ratio – calendar year | 32.50% | 27.60% | 38.70% | 33.30%
Underwriting expense ratio | 34.90% | 36.60% | 34.50% | 32.60%
Combined ratio | 67.40% | 64.20% | 73.20% | 65.90%
Catastrophe Reinsurance | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | $ 67,394 | $ 81,692 | $ 825,271 | $ 856,305
Net premiums written | 37,526 | 55,182 | 481,956 | 548,312
Net premiums earned | 121,062 | 159,641 | 399,663 | 466,113
Net claims and claim expenses incurred | 927 | 22,319 | 64,878 | 85,289
Acquisition expenses | 7,603 | 14,048 | 33,410 | 41,016
Operational expenses | 16,355 | 23,513 | 55,308 | 65,966
Underwriting income (loss) | 96,177 | 99,761 | 246,067 | 273,842
Net claims and claim expenses incurred – current accident year | 18,267 | 36,244 | 102,471 | 127,702
Net claims and claim expenses incurred – prior accident years | (17,340) | (13,925) | (37,593) | (42,413)
Net claims and claim expenses incurred – total | $ 927 | $ 22,319 | $ 64,878 | $ 85,289
Net claims and claim expense ratio – current accident year | 15.10% | 22.70% | 25.60% | 27.40%
Net claims and claim expense ratio – prior accident years | (14.30%) | (8.70%) | (9.40%) | (9.10%)
Net claims and claim expense ratio – calendar year | 0.80% | 14.00% | 16.20% | 18.30%
Underwriting expense ratio | 19.80% | 23.50% | 22.20% | 22.90%
Combined ratio | 20.60% | 37.50% | 38.40% | 41.20%
Specialty Reinsurance | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | $ 270,876 | $ 214,372 | $ 840,598 | $ 498,676
Net premiums written | 177,331 | 155,987 | 569,842 | 399,769
Net premiums earned | 150,766 | 146,213 | 443,252 | 396,673
Net claims and claim expenses incurred | 82,113 | 41,005 | 241,666 | 166,655
Acquisition expenses | 52,019 | 50,432 | 127,871 | 99,372
Operational expenses | 15,360 | 17,542 | 57,092 | 49,579
Underwriting income (loss) | 1,274 | 37,234 | 16,623 | 81,067
Net claims and claim expenses incurred – current accident year | 102,025 | 96,737 | 275,520 | 250,316
Net claims and claim expenses incurred – prior accident years | (19,912) | (55,732) | (33,854) | (83,661)
Net claims and claim expenses incurred – total | $ 82,113 | $ 41,005 | $ 241,666 | $ 166,655
Net claims and claim expense ratio – current accident year | 67.70% | 66.20% | 62.20% | 63.10%
Net claims and claim expense ratio – prior accident years | (13.20%) | (38.20%) | (7.70%) | (21.10%)
Net claims and claim expense ratio – calendar year | 54.50% | 28.00% | 54.50% | 42.00%
Underwriting expense ratio | 44.70% | 46.50% | 41.70% | 37.60%
Combined ratio | 99.20% | 74.50% | 96.20% | 79.60%
Lloyd's | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | $ 91,954 | $ 73,578 | $ 385,616 | $ 320,326
Net premiums written | 69,365 | 55,651 | 264,015 | 231,540
Net premiums earned | 74,693 | 56,534 | 208,614 | 176,279
Net claims and claim expenses incurred | 29,337 | 36,425 | 100,185 | 93,951
Acquisition expenses | 20,958 | 13,654 | 53,896 | 42,557
Operational expenses | 8,760 | 13,427 | 35,302 | 39,086
Underwriting income (loss) | 15,638 | (6,972) | 19,231 | 685
Net claims and claim expenses incurred – current accident year | 38,068 | 37,397 | 105,583 | 93,778
Net claims and claim expenses incurred – prior accident years | (8,731) | (972) | (5,398) | 173
Net claims and claim expenses incurred – total | $ 29,337 | $ 36,425 | $ 100,185 | $ 93,951
Net claims and claim expense ratio – current accident year | 51.00% | 66.10% | 50.60% | 53.20%
Net claims and claim expense ratio – prior accident years | (11.70%) | (1.70%) | (2.60%) | 0.10%
Net claims and claim expense ratio – calendar year | 39.30% | 64.40% | 48.00% | 53.30%
Underwriting expense ratio | 39.80% | 47.90% | 42.80% | 46.30%
Combined ratio | 79.10% | 112.30% | 90.80% | 99.60%
Other | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | $ 0 | $ 0 | $ 0 | $ (90)
Net premiums written | 0 | 0 | 0 | (89)
Net premiums earned | 0 | 0 | 0 | (89)
Net claims and claim expenses incurred | 198 | 279 | 201 | 330
Acquisition expenses | 0 | (8) | 0 | 248
Operational expenses | 18 | 36 | 99 | 181
Underwriting income (loss) | (216) | (307) | (300) | (848)
Net investment income | 51,423 | 28,338 | 134,410 | 106,649
Net foreign exchange (losses) gains | (5,986) | 616 | (8,368) | (4,254)
Equity in (losses) earnings of other ventures | (11,630) | 5,730 | (3,997) | 17,185
Other income | 2,268 | 2,306 | 9,001 | 5,272
Net realized and unrealized gains (losses) on investments | 59,870 | (41,138) | 191,295 | (26,101)
Corporate expenses | (11,537) | (7,322) | (25,514) | (65,723)
Interest expense | (10,536) | (10,542) | (31,610) | (25,720)
Income tax benefit (expense) | 1,316 | 4,573 | (8,040) | 54,319
Net income attributable to redeemable noncontrolling interests | (35,641) | (31,153) | (110,867) | (82,982)
Dividends on preference shares | (5,595) | (5,595) | (16,786) | (16,786)
Net claims and claim expenses incurred – current accident year | 0 | 0 | 0 | 0
Net claims and claim expenses incurred – prior accident years | 198 | 279 | 201 | 330
Net claims and claim expenses incurred – total | $ 198 | $ 279 | $ 201 | 330
Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written |  |  |  | $ 100

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