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Segment Reporting (Schedule of Significant Components of the Company's Revenues and Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | $ 1,143,058 | $ 861,068 | $ 4,870,651 | $ 3,902,271
Net premiums written | 899,411 | 704,130 | 3,350,022 | 2,656,126
Net premiums earned | 1,000,183 | 906,748 | 2,923,377 | 2,368,278
Net claims and claim expenses incurred | 942,030 | 654,520 | 2,023,256 | 1,334,928
Acquisition expenses | 215,180 | 202,181 | 659,394 | 553,614
Operational expenses | 49,045 | 53,415 | 165,583 | 158,162
Underwriting income (loss) | (206,072) | (3,368) | 75,144 | 321,574
Net investment income | 83,543 | 111,387 | 272,321 | 312,069
Net foreign exchange gains (losses) | 17,426 | (8,275) | 4,503 | (1,812)
Equity in earnings of other ventures | 5,457 | 5,877 | 19,062 | 17,350
Other income (loss) | 1,476 | 1,016 | (4,161) | 5,109
Net realized and unrealized gains on investments | 224,208 | 34,395 | 561,891 | 395,655
Corporate expenses | (48,050) | (13,844) | (75,939) | (76,480)
Interest expense | (11,843) | (15,580) | (38,612) | (42,868)
Income before taxes | 66,145 | 111,608 | 814,209 | 930,597
Income tax benefit (expense) | 8,244 | (3,664) | (12,785) | (20,670)
Net income attributable to redeemable noncontrolling interests | (19,301) | (62,057) | (236,120) | (204,091)
Dividends on preference shares | (7,289) | (9,189) | (23,634) | (27,567)
Net income available to RenaissanceRe common shareholders | 47,799 | 36,698 | 541,670 | 678,269
Net claims and claim expenses incurred – current accident year | 995,907 | 664,967 | 2,078,639 | 1,349,448
Net claims and claim expenses incurred – prior accident years | (53,877) | (10,447) | (55,383) | (14,520)
Total net incurred | $ 942,030 | $ 654,520 | $ 2,023,256 | $ 1,334,928
Net claims and claim expense ratio – current accident year | 99.60% | 73.30% | 71.10% | 57.00%
Net claims and claim expense ratio – prior accident years | (5.40%) | (1.10%) | (1.90%) | (0.60%)
Net claims and claim expense ratio – calendar year | 94.20% | 72.20% | 69.20% | 56.40%
Underwriting expense ratio | 26.40% | 28.20% | 28.20% | 30.00%
Combined ratio | 120.60% | 100.40% | 97.40% | 86.40%
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | $ 0 | $ 0 | $ 0 | $ 0
Net premiums written | 0 | 0 | 0 | 0
Net premiums earned | 0 | 0 | 0 | 0
Net claims and claim expenses incurred | 20 | 161 | (131) | 178
Acquisition expenses | (1) | 6 | 0 | (186)
Operational expenses | 54 | (21) | 53 | 13
Underwriting income (loss) | (73) | (146) | 78 | (5)
Net investment income | 83,543 | 111,387 | 272,321 | 312,069
Net foreign exchange gains (losses) | 17,426 | (8,275) | 4,503 | (1,812)
Equity in earnings of other ventures | 5,457 | 5,877 | 19,062 | 17,350
Other income (loss) | 1,476 | 1,016 | (4,161) | 5,109
Net realized and unrealized gains on investments | 224,208 | 34,395 | 561,891 | 395,655
Corporate expenses | (48,050) | (13,844) | (75,939) | (76,480)
Interest expense | (11,843) | (15,580) | (38,612) | (42,868)
Income tax benefit (expense) | 8,244 | (3,664) | (12,785) | (20,670)
Net income attributable to redeemable noncontrolling interests | (19,301) | (62,057) | (236,120) | (204,091)
Dividends on preference shares | (7,289) | (9,189) | (23,634) | (27,567)
Net claims and claim expenses incurred – current accident year | 0 | 0 | 0 | 0
Net claims and claim expenses incurred – prior accident years | 20 | 161 | (131) | 178
Total net incurred | 20 | 161 | (131) | 178
Property |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (31,425) | 5,020
Property | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | 427,765 | 314,400 | 2,690,827 | 2,185,984
Net premiums written | 378,708 | 302,982 | 1,757,427 | 1,411,327
Net premiums earned | 516,623 | 444,332 | 1,429,074 | 1,160,090
Net claims and claim expenses incurred | 590,958 | 338,260 | 899,860 | 541,217
Acquisition expenses | 98,545 | 79,521 | 278,668 | 222,971
Operational expenses | 33,672 | 34,238 | 109,335 | 99,546
Underwriting income (loss) | (206,552) | (7,687) | 141,211 | 296,356
Net claims and claim expenses incurred – current accident year | 629,827 | 345,880 | 931,285 | 536,197
Net claims and claim expenses incurred – prior accident years | (38,869) | (7,620) | (31,425) | 5,020
Total net incurred | $ 590,958 | $ 338,260 | $ 899,860 | $ 541,217
Net claims and claim expense ratio – current accident year | 121.90% | 77.80% | 65.20% | 46.20%
Net claims and claim expense ratio – prior accident years | (7.50%) | (1.70%) | (2.20%) | 0.50%
Net claims and claim expense ratio – calendar year | 114.40% | 76.10% | 63.00% | 46.70%
Underwriting expense ratio | 25.60% | 25.60% | 27.10% | 27.80%
Combined ratio | 140.00% | 101.70% | 90.10% | 74.50%
Casualty and Specialty |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | $ (23,827) | $ (19,718)
Casualty and Specialty | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross premiums written | $ 715,293 | $ 546,668 | 2,179,824 | 1,716,287
Net premiums written | 520,703 | 401,148 | 1,592,595 | 1,244,799
Net premiums earned | 483,560 | 462,416 | 1,494,303 | 1,208,188
Net claims and claim expenses incurred | 351,052 | 316,099 | 1,123,527 | 793,533
Acquisition expenses | 116,636 | 122,654 | 380,726 | 330,829
Operational expenses | 15,319 | 19,198 | 56,195 | 58,603
Underwriting income (loss) | 553 | 4,465 | (66,145) | 25,223
Net claims and claim expenses incurred – current accident year | 366,080 | 319,087 | 1,147,354 | 813,251
Net claims and claim expenses incurred – prior accident years | (15,028) | (2,988) | (23,827) | (19,718)
Total net incurred | $ 351,052 | $ 316,099 | $ 1,123,527 | $ 793,533
Net claims and claim expense ratio – current accident year | 75.70% | 69.00% | 76.80% | 67.30%
Net claims and claim expense ratio – prior accident years | (3.10%) | (0.60%) | (1.60%) | (1.60%)
Net claims and claim expense ratio – calendar year | 72.60% | 68.40% | 75.20% | 65.70%
Underwriting expense ratio | 27.30% | 30.60% | 29.20% | 32.20%
Combined ratio | 99.90% | 99.00% | 104.40% | 97.90%

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