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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, 2019
Mar. 31, 2018
Segment Reporting Information [Line Items]    
Gross premiums written $ 1,564,295 $ 1,159,652
Net premiums written 929,031 663,044
Net premiums earned 550,028 440,282
Net claims and claim expenses incurred 227,035 171,703
Acquisition expenses 123,951 97,711
Operational expenses 44,933 41,272
Underwriting income (loss) 154,109 129,596
Net investment income 81,462 56,476
Net foreign exchange (losses) gains (2,846) 3,757
Equity in earnings of other ventures 4,661 857
Other income (loss) 3,171 (1,242)
Net realized and unrealized gains (losses) on investments 170,645 (82,144)
Corporate expenses (38,789) (6,733)
Interest expense (11,754) (11,767)
Income before taxes 360,659 88,800
Income tax (expense) benefit (7,531) 3,407
Net income attributable to redeemable noncontrolling interests (70,222) (29,899)
Dividends on preference shares (9,189) (5,595)
Net income available to RenaissanceRe common shareholders 273,717 56,713
Net claims and claim expenses incurred – current accident year 231,341 203,038
Net claims and claim expenses incurred – prior accident years (4,306) (31,335)
Total net incurred $ 227,035 $ 171,703
Net claims and claim expense ratio – current accident year 42.10% 46.10%
Net claims and claim expense ratio – prior accident years (0.80%) (7.10%)
Net claims and claim expense ratio – calendar year 41.30% 39.00%
Underwriting expense ratio 30.70% 31.60%
Combined ratio 72.00% 70.60%
Other    
Segment Reporting Information [Line Items]    
Gross premiums written $ 0 $ 0
Net premiums written 0 0
Net premiums earned 0 0
Net claims and claim expenses incurred 19 18
Acquisition expenses 0 0
Operational expenses 0 133
Underwriting income (loss) (19) (151)
Net investment income 81,462 56,476
Net foreign exchange (losses) gains (2,846) 3,757
Equity in earnings of other ventures 4,661 857
Other income (loss) 3,171 (1,242)
Net realized and unrealized gains (losses) on investments 170,645 (82,144)
Corporate expenses (38,789) (6,733)
Interest expense (11,754) (11,767)
Income tax (expense) benefit (7,531) 3,407
Net income attributable to redeemable noncontrolling interests (70,222) (29,899)
Dividends on preference shares (9,189) (5,595)
Net claims and claim expenses incurred – current accident year 0 0
Net claims and claim expenses incurred – prior accident years 19 18
Total net incurred 19 18
Property    
Segment Reporting Information [Line Items]    
Net claims and claim expenses incurred – prior accident years 1,877 (27,562)
Property | Operating Segments    
Segment Reporting Information [Line Items]    
Gross premiums written 1,032,384 706,968
Net premiums written 564,230 354,077
Net premiums earned 290,745 225,049
Net claims and claim expenses incurred 56,083 30,607
Acquisition expenses 53,739 40,721
Operational expenses 28,544 26,546
Underwriting income (loss) 152,379 127,175
Net claims and claim expenses incurred – current accident year 54,206 58,169
Net claims and claim expenses incurred – prior accident years 1,877 (27,562)
Total net incurred $ 56,083 $ 30,607
Net claims and claim expense ratio – current accident year 18.60% 25.80%
Net claims and claim expense ratio – prior accident years 0.70% (12.20%)
Net claims and claim expense ratio – calendar year 19.30% 13.60%
Underwriting expense ratio 28.30% 29.90%
Combined ratio 47.60% 43.50%
Casualty and Specialty    
Segment Reporting Information [Line Items]    
Net claims and claim expenses incurred – prior accident years $ (6,202) $ (3,791)
Casualty and Specialty | Operating Segments    
Segment Reporting Information [Line Items]    
Gross premiums written 531,911 452,684
Net premiums written 364,801 308,967
Net premiums earned 259,283 215,233
Net claims and claim expenses incurred 170,933 141,078
Acquisition expenses 70,212 56,990
Operational expenses 16,389 14,593
Underwriting income (loss) 1,749 2,572
Net claims and claim expenses incurred – current accident year 177,135 144,869
Net claims and claim expenses incurred – prior accident years (6,202) (3,791)
Total net incurred $ 170,933 $ 141,078
Net claims and claim expense ratio – current accident year 68.30% 67.30%
Net claims and claim expense ratio – prior accident years (2.40%) (1.80%)
Net claims and claim expense ratio – calendar year 65.90% 65.50%
Underwriting expense ratio 33.40% 33.30%
Combined ratio 99.30% 98.80%