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Segment Reporting (Schedule Of Significant Components Of The Company's Revenues And Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]    
Gross premiums written $ 862,133 $ 643,578
Net premiums written 511,675 404,035
Net premiums earned 353,606 296,760
Net claims and claim expenses incurred 126,605 76,853
Acquisition expenses 65,592 43,401
Operational expenses 56,235 45,621
Underwriting income (loss) 105,174 130,885
Net investment income 28,863 39,707
Net foreign exchange losses (1,692) (3,130)
Equity in earnings of other ventures 1,611 5,295
Other income 4,079 1,539
Net realized and unrealized gains on investments 61,653 41,749
Corporate expenses (8,225) (45,533)
Interest expense (10,538) (5,316)
Income before taxes 180,925 165,196
Income tax (expense) benefit (2,744) 47,904
Net income attributable to redeemable noncontrolling interests (44,591) (39,662)
Dividends on preference shares (5,595) (5,595)
Net income available to RenaissanceRe common shareholders 127,995 167,843
Net claims and claim expenses incurred – current accident year 128,209 98,998
Net claims and claim expenses incurred – prior accident years (1,604) (22,145)
Net claims and claim expenses incurred – total $ 126,605 $ 76,853
Net claims and claim expense ratio – current accident year 36.30% 33.40%
Net claims and claim expense ratio – prior accident years (0.50%) (7.50%)
Net claims and claim expense ratio – calendar year 35.80% 25.90%
Underwriting expense ratio 34.50% 30.00%
Combined ratio 70.30% 55.90%
Catastrophe Reinsurance | Operating Segments    
Segment Reporting Information [Line Items]    
Gross premiums written $ 360,423 $ 389,247
Net premiums written 188,785 222,640
Net premiums earned 136,985 143,767
Net claims and claim expenses incurred 7,820 7,594
Acquisition expenses 9,580 7,654
Operational expenses 20,268 20,363
Underwriting income (loss) 99,317 108,156
Net claims and claim expenses incurred – current accident year 13,883 24,124
Net claims and claim expenses incurred – prior accident years (6,063) (16,530)
Net claims and claim expenses incurred – total $ 7,820 $ 7,594
Net claims and claim expense ratio – current accident year 10.10% 16.80%
Net claims and claim expense ratio – prior accident years (4.40%) (11.50%)
Net claims and claim expense ratio – calendar year 5.70% 5.30%
Underwriting expense ratio 21.80% 19.50%
Combined ratio 27.50% 24.80%
Specialty Reinsurance | Operating Segments    
Segment Reporting Information [Line Items]    
Gross premiums written $ 368,989 $ 124,291
Net premiums written 260,091 103,915
Net premiums earned 155,318 94,876
Net claims and claim expenses incurred 91,852 39,588
Acquisition expenses 41,725 20,689
Operational expenses 21,773 13,290
Underwriting income (loss) (32) 21,309
Net claims and claim expenses incurred – current accident year 88,378 49,264
Net claims and claim expenses incurred – prior accident years 3,474 (9,676)
Net claims and claim expenses incurred – total $ 91,852 $ 39,588
Net claims and claim expense ratio – current accident year 56.90% 51.90%
Net claims and claim expense ratio – prior accident years 2.20% (10.20%)
Net claims and claim expense ratio – calendar year 59.10% 41.70%
Underwriting expense ratio 40.90% 35.80%
Combined ratio 100.00% 77.50%
Lloyd's | Operating Segments    
Segment Reporting Information [Line Items]    
Gross premiums written $ 132,721 $ 130,130
Net premiums written 62,799 77,569
Net premiums earned 61,303 58,206
Net claims and claim expenses incurred 27,016 29,843
Acquisition expenses 14,287 14,693
Operational expenses 14,134 11,940
Underwriting income (loss) 5,866 1,730
Net claims and claim expenses incurred – current accident year 25,948 25,610
Net claims and claim expenses incurred – prior accident years 1,068 4,233
Net claims and claim expenses incurred – total $ 27,016 $ 29,843
Net claims and claim expense ratio – current accident year 42.30% 44.00%
Net claims and claim expense ratio – prior accident years 1.80% 7.30%
Net claims and claim expense ratio – calendar year 44.10% 51.30%
Underwriting expense ratio 46.30% 45.70%
Combined ratio 90.40% 97.00%
Other | Operating Segments    
Segment Reporting Information [Line Items]    
Gross premiums written $ 0 $ (90)
Net premiums written 0 (89)
Net premiums earned 0 (89)
Net claims and claim expenses incurred (83) (172)
Acquisition expenses 0 365
Operational expenses 60 28
Underwriting income (loss) 23 (310)
Net investment income 28,863 39,707
Net foreign exchange losses (1,692) (3,130)
Equity in earnings of other ventures 1,611 5,295
Other income 4,079 1,539
Net realized and unrealized gains on investments 61,653 41,749
Corporate expenses (8,225) (45,533)
Interest expense (10,538) (5,316)
Income tax (expense) benefit (2,744) 47,904
Net income attributable to redeemable noncontrolling interests (44,591) (39,662)
Dividends on preference shares (5,595) (5,595)
Net claims and claim expenses incurred – current accident year 0 0
Net claims and claim expenses incurred – prior accident years (83) (172)
Net claims and claim expenses incurred – total $ (83) (172)
Intersegment Eliminations    
Segment Reporting Information [Line Items]    
Gross premiums written   $ 100