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Segment Reporting (Schedule Of Significant Components Of The Company's Revenues And Expenses) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Segment Reporting Information [Line Items] |  |
Gross premiums written | $ 705,260 | $ 635,418
Net premiums written | 450,347 | 436,813
Net premiums earned | 286,534 | 271,255
Net claims and claim expenses incurred | 58,915 | 27,251
Acquisition expenses | 33,700 | 25,009
Operational expenses | 42,624 | 45,986
Underwriting income | 151,295 | 173,009
Net investment income | 38,948 | 43,202
Net foreign exchange (losses) gains | (1,061) | 614
Equity in earnings of other ventures | 4,199 | 5,835
Other income (loss) | 62 | (1,709)
Net realized and unrealized gains on investments | 14,927 | 14,269
Corporate expenses | (4,545) | (4,482)
Interest expense | (4,293) | (5,034)
Income from continuing operations before taxes | 199,532 | 225,704
Income tax expense | (166) | (122)
Income from discontinued operations | 0 | 9,774
Net income attributable to noncontrolling interests | (42,768) | (38,607)
Dividends on preference shares | (5,595) | (6,275)
Net income available to RenaissanceRe common shareholders | 151,003 | 190,474
Net claims and claim expenses incurred - current accident year | 75,608 | 64,900
Net claims and claim expenses incurred – prior accident years | (16,693) | (37,649)
Net claims and claim expenses incurred | 58,915 | 27,251
Net claims and claim expense ratio - current accident year | 26.40% | 23.90%
Net claims and claim expense ratio - prior accident years | (5.80%) | (13.90%)
Net claims and claim expense ratio - calendar year | 20.60% | 10.00%
Underwriting expense ratio | 26.60% | 26.20%
Combined ratio | 47.20% | 36.20%
Catastrophe Reinsurance |  |
Segment Reporting Information [Line Items] |  |
Gross premiums written | 467,711 | 478,796
Net premiums written | 259,489 | 305,353
Net premiums earned | 164,584 | 186,651
Net claims and claim expenses incurred | 6,455 | 2,708
Acquisition expenses | 7,126 | 9,620
Operational expenses | 20,419 | 26,115
Underwriting income | 130,584 | 148,208
Net claims and claim expenses incurred - current accident year | 12,529 | 21,176
Net claims and claim expenses incurred – prior accident years | (6,074) | (18,468)
Net claims and claim expenses incurred | 6,455 | 2,708
Net claims and claim expense ratio - current accident year | 7.60% | 11.30%
Net claims and claim expense ratio - prior accident years | (3.70%) | (9.80%)
Net claims and claim expense ratio - calendar year | 3.90% | 1.50%
Underwriting expense ratio | 16.80% | 19.10%
Combined ratio | 20.70% | 20.60%
Specialty Reinsurance |  |
Segment Reporting Information [Line Items] |  |
Gross premiums written | 154,290 | 82,330
Net premiums written | 125,489 | 75,519
Net premiums earned | 69,630 | 46,809
Net claims and claim expenses incurred | 26,081 | 10,692
Acquisition expenses | 16,547 | 8,439
Operational expenses | 10,106 | 7,560
Underwriting income | 16,896 | 20,118
Net claims and claim expenses incurred - current accident year | 41,922 | 25,853
Net claims and claim expenses incurred – prior accident years | (15,841) | (15,161)
Net claims and claim expenses incurred | 26,081 | 10,692
Net claims and claim expense ratio - current accident year | 60.20% | 55.20%
Net claims and claim expense ratio - prior accident years | (22.70%) | (32.40%)
Net claims and claim expense ratio - calendar year | 37.50% | 22.80%
Underwriting expense ratio | 38.20% | 34.20%
Combined ratio | 75.70% | 57.00%
Lloyd's |  |
Segment Reporting Information [Line Items] |  |
Gross premiums written | 83,259 | 74,292
Net premiums written | 65,369 | 55,924
Net premiums earned | 52,297 | 37,779
Net claims and claim expenses incurred | 26,281 | 14,528
Acquisition expenses | 10,567 | 6,916
Operational expenses | 12,033 | 12,178
Underwriting income | 3,416 | 4,157
Net claims and claim expenses incurred - current accident year | 21,157 | 17,871
Net claims and claim expenses incurred – prior accident years | 5,124 | (3,343)
Net claims and claim expenses incurred | 26,281 | 14,528
Net claims and claim expense ratio - current accident year | 40.50% | 47.30%
Net claims and claim expense ratio - prior accident years | 9.80% | (8.80%)
Net claims and claim expense ratio - calendar year | 50.30% | 38.50%
Underwriting expense ratio | 43.20% | 50.50%
Combined ratio | 93.50% | 89.00%
Other |  |
Segment Reporting Information [Line Items] |  |
Gross premiums written | 0 | 0
Net premiums written | 0 | 17
Net premiums earned | 23 | 16
Net claims and claim expenses incurred | 98 | (677)
Acquisition expenses | (540) | 34
Operational expenses | 66 | 133
Underwriting income | 399 | 526
Net investment income | 38,948 | 43,202
Net foreign exchange (losses) gains | (1,061) | 614
Equity in earnings of other ventures | 4,199 | 5,835
Other income (loss) | 62 | (1,709)
Net realized and unrealized gains on investments | 14,927 | 14,269
Corporate expenses | (4,545) | (4,482)
Interest expense | (4,293) | (5,034)
Income tax expense | (166) | (122)
Income from discontinued operations |  | 9,774
Net income attributable to noncontrolling interests | (42,768) | (38,607)
Dividends on preference shares | (5,595) | (6,275)
Net claims and claim expenses incurred - current accident year | 0 | 0
Net claims and claim expenses incurred – prior accident years | 98 | (677)
Net claims and claim expenses incurred | $ 98 | $ (677)
Net claims and claim expense ratio - current accident year | 0.00% | 0.00%
Net claims and claim expense ratio - prior accident years | 426.10% | (4231.30%)
Net claims and claim expense ratio - calendar year | 426.10% | (4231.30%)
Underwriting expense ratio | (2060.90%) | 1218.80%
Combined ratio | (1634.80%) | (3012.50%)

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