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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, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | $ 759,128 | $ 661,997 | $ 1,621,261 | $ 1,305,575
Net premiums written | 519,916 | 508,677 | 1,031,591 | 912,712
Net premiums earned | 351,402 | 379,828 | 705,008 | 676,588
Net claims and claim expenses incurred | 167,750 | 169,344 | 294,355 | 246,197
Acquisition expenses | 69,005 | 61,666 | 134,597 | 105,067
Operational expenses | 51,073 | 54,673 | 107,308 | 100,294
Underwriting income (loss) | 63,574 | 94,145 | 168,748 | 225,030
Net investment income | 54,124 | 38,604 | 82,987 | 78,311
Net foreign exchange losses | (690) | (1,740) | (2,382) | (4,870)
Equity in earnings of other ventures | 6,022 | 6,160 | 7,633 | 11,455
Other income | 2,654 | 1,427 | 6,733 | 2,966
Net realized and unrealized gains (losses) on investments | 69,772 | (26,712) | 131,425 | 15,037
Corporate expenses | (5,752) | (12,868) | (13,977) | (58,401)
Interest expense | (10,536) | (9,862) | (21,074) | (15,178)
Income before taxes | 179,168 | 89,154 | 360,093 | 254,350
Income tax (expense) benefit | (6,612) | 1,842 | (9,356) | 49,746
Net income attributable to redeemable noncontrolling interests | (30,635) | (12,167) | (75,226) | (51,829)
Dividends on preference shares | (5,596) | (5,596) | (11,191) | (11,191)
Net income available to RenaissanceRe common shareholders | 136,325 | 73,233 | 264,320 | 241,076
Net claims and claim expenses incurred – current accident year | 197,005 | 202,420 | 325,214 | 301,418
Net claims and claim expenses incurred – prior accident years | (29,255) | (33,076) | (30,859) | (55,221)
Net claims and claim expenses incurred – total | $ 167,750 | $ 169,344 | $ 294,355 | $ 246,197
Net claims and claim expense ratio – current accident year | 56.10% | 53.30% | 46.10% | 44.50%
Net claims and claim expense ratio – prior accident years | (8.40%) | (8.70%) | (4.30%) | (8.10%)
Net claims and claim expense ratio – calendar year | 47.70% | 44.60% | 41.80% | 36.40%
Underwriting expense ratio | 34.20% | 30.60% | 34.30% | 30.30%
Combined ratio | 81.90% | 75.20% | 76.10% | 66.70%
Catastrophe Reinsurance | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | $ 397,454 | $ 385,366 | $ 757,877 | $ 774,613
Net premiums written | 255,645 | 270,490 | 444,430 | 493,130
Net premiums earned | 141,616 | 162,705 | 278,601 | 306,472
Net claims and claim expenses incurred | 56,131 | 55,376 | 63,951 | 62,970
Acquisition expenses | 16,227 | 19,314 | 25,807 | 26,968
Operational expenses | 18,685 | 22,090 | 38,953 | 42,453
Underwriting income (loss) | 50,573 | 65,925 | 149,890 | 174,081
Net claims and claim expenses incurred – current accident year | 70,321 | 67,334 | 84,204 | 91,458
Net claims and claim expenses incurred – prior accident years | (14,190) | (11,958) | (20,253) | (28,488)
Net claims and claim expenses incurred – total | $ 56,131 | $ 55,376 | $ 63,951 | $ 62,970
Net claims and claim expense ratio – current accident year | 49.70% | 41.40% | 30.20% | 29.80%
Net claims and claim expense ratio – prior accident years | (10.10%) | (7.40%) | (7.20%) | (9.30%)
Net claims and claim expense ratio – calendar year | 39.60% | 34.00% | 23.00% | 20.50%
Underwriting expense ratio | 24.70% | 25.50% | 23.20% | 22.70%
Combined ratio | 64.30% | 59.50% | 46.20% | 43.20%
Specialty Reinsurance | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | $ 200,733 | $ 160,013 | $ 569,722 | $ 284,304
Net premiums written | 132,420 | 139,867 | 392,511 | 243,782
Net premiums earned | 137,168 | 155,584 | 292,486 | 250,460
Net claims and claim expenses incurred | 67,701 | 86,062 | 159,553 | 125,650
Acquisition expenses | 34,127 | 28,251 | 75,852 | 48,940
Operational expenses | 19,959 | 18,747 | 41,732 | 32,037
Underwriting income (loss) | 15,381 | 22,524 | 15,349 | 43,833
Net claims and claim expenses incurred – current accident year | 85,117 | 104,315 | 173,495 | 153,579
Net claims and claim expenses incurred – prior accident years | (17,416) | (18,253) | (13,942) | (27,929)
Net claims and claim expenses incurred – total | $ 67,701 | $ 86,062 | $ 159,553 | $ 125,650
Net claims and claim expense ratio – current accident year | 62.10% | 67.00% | 59.30% | 61.30%
Net claims and claim expense ratio – prior accident years | (12.70%) | (11.70%) | (4.70%) | (11.10%)
Net claims and claim expense ratio – calendar year | 49.40% | 55.30% | 54.60% | 50.20%
Underwriting expense ratio | 39.40% | 30.20% | 40.20% | 32.30%
Combined ratio | 88.80% | 85.50% | 94.80% | 82.50%
Lloyd's | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | $ 160,941 | $ 116,618 | $ 293,662 | $ 246,748
Net premiums written | 131,851 | 98,320 | 194,650 | 175,889
Net premiums earned | 72,618 | 61,539 | 133,921 | 119,745
Net claims and claim expenses incurred | 43,832 | 27,683 | 70,848 | 57,526
Acquisition expenses | 18,651 | 14,210 | 32,938 | 28,903
Operational expenses | 12,408 | 13,719 | 26,542 | 25,659
Underwriting income (loss) | (2,273) | 5,927 | 3,593 | 7,657
Net claims and claim expenses incurred – current accident year | 41,567 | 30,771 | 67,515 | 56,381
Net claims and claim expenses incurred – prior accident years | 2,265 | (3,088) | 3,333 | 1,145
Net claims and claim expenses incurred – total | $ 43,832 | $ 27,683 | $ 70,848 | $ 57,526
Net claims and claim expense ratio – current accident year | 57.20% | 50.00% | 50.40% | 47.10%
Net claims and claim expense ratio – prior accident years | 3.20% | (5.00%) | 2.50% | 0.90%
Net claims and claim expense ratio – calendar year | 60.40% | 45.00% | 52.90% | 48.00%
Underwriting expense ratio | 42.70% | 45.40% | 44.40% | 45.60%
Combined ratio | 103.10% | 90.40% | 97.30% | 93.60%
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 | 86 | 223 | 3 | 51
Acquisition expenses | 0 | (109) | 0 | 256
Operational expenses | 21 | 117 | 81 | 145
Underwriting income (loss) | (107) | (231) | (84) | (541)
Net investment income | 54,124 | 38,604 | 82,987 | 78,311
Net foreign exchange losses | (690) | (1,740) | (2,382) | (4,870)
Equity in earnings of other ventures | 6,022 | 6,160 | 7,633 | 11,455
Other income | 2,654 | 1,427 | 6,733 | 2,966
Net realized and unrealized gains (losses) on investments | 69,772 | (26,712) | 131,425 | 15,037
Corporate expenses | (5,752) | (12,868) | (13,977) | (58,401)
Interest expense | (10,536) | (9,862) | (21,074) | (15,178)
Income tax (expense) benefit | (6,612) | 1,842 | (9,356) | 49,746
Net income attributable to redeemable noncontrolling interests | (30,635) | (12,167) | (75,226) | (51,829)
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 | 86 | 223 | 3 | 51
Net claims and claim expenses incurred – total | $ 86 | $ 223 | $ 3 | 51
Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written |  |  |  | $ 100

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