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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%)