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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, 2023 | Mar. 31, 2022
Segment Reporting Information [Line Items] |  |
Gross premiums written | $ 2,790,261 | $ 2,942,964
Net premiums written | 2,263,703 | 2,165,217
Net premiums earned | 1,680,550 | 1,486,425
Net claims and claim expenses incurred | 801,200 | 841,733
Acquisition expenses | 432,257 | 376,507
Operational expenses | 77,474 | 67,907
Underwriting income (loss) | 369,619 | 200,278
Net investment income | 254,378 | 83,691
Net foreign exchange gain (loss) | (14,503) | (15,486)
Equity in earnings (losses) of other ventures | 9,530 | (6,390)
Other income (loss) | (4,306) | 1,193
Net realized and unrealized gains (losses) on investments | 279,451 | (673,017)
Corporate expenses | (12,843) | (12,502)
Interest expense | (12,134) | (11,955)
Income (loss) before taxes | 869,192 | (434,188)
Income tax benefit (expense) | (28,902) | 36,707
Net (income) loss attributable to redeemable noncontrolling interests | (267,384) | 11,912
Dividends on preference shares | (8,844) | (8,844)
Net income (loss) available (attributable) to RenaissanceRe common shareholders | 564,062 | (394,413)
Net claims and claim expenses incurred – current accident year | 905,952 | 859,566
Net claims and claim expenses incurred – prior accident years | (104,752) | (17,833)
Total net incurred | $ 801,200 | $ 841,733
Net claims and claim expense ratio – current accident year | 53.90% | 57.80%
Net claims and claim expense ratio – prior accident years | (6.20%) | (1.20%)
Net claims and claim expense ratio – calendar year | 47.70% | 56.60%
Underwriting expense ratio | 30.30% | 29.90%
Combined ratio | 78.00% | 86.50%
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 | 0 | 0
Acquisition expenses | 0 | 0
Operational expenses | 0 | 0
Underwriting income (loss) | 0 | 0
Net investment income | 254,378 | 83,691
Net foreign exchange gain (loss) | (14,503) | (15,486)
Equity in earnings (losses) of other ventures | 9,530 | (6,390)
Other income (loss) | (4,306) | 1,193
Net realized and unrealized gains (losses) on investments | 279,451 | (673,017)
Corporate expenses | (12,843) | (12,502)
Interest expense | (12,134) | (11,955)
Income tax benefit (expense) | (28,902) | 36,707
Net (income) loss attributable to redeemable noncontrolling interests | (267,384) | 11,912
Dividends on preference shares | (8,844) | (8,844)
Net claims and claim expenses incurred – current accident year | 0 | 0
Net claims and claim expenses incurred – prior accident years | 0 | 0
Total net incurred | 0 | 0
Property |  |
Segment Reporting Information [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (81,693) | (16,758)
Property | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Gross premiums written | 1,304,199 | 1,343,508
Net premiums written | 1,019,829 | 890,166
Net premiums earned | 687,420 | 618,591
Net claims and claim expenses incurred | 187,609 | 259,761
Acquisition expenses | 145,319 | 127,096
Operational expenses | 55,813 | 46,932
Underwriting income (loss) | 298,679 | 184,802
Net claims and claim expenses incurred – current accident year | 269,302 | 276,519
Net claims and claim expenses incurred – prior accident years | (81,693) | (16,758)
Total net incurred | $ 187,609 | $ 259,761
Net claims and claim expense ratio – current accident year | 39.20% | 44.70%
Net claims and claim expense ratio – prior accident years | (11.90%) | (2.70%)
Net claims and claim expense ratio – calendar year | 27.30% | 42.00%
Underwriting expense ratio | 29.30% | 28.10%
Combined ratio | 56.60% | 70.10%
Casualty and Specialty |  |
Segment Reporting Information [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | $ (23,059) | $ (1,075)
Casualty and Specialty | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Gross premiums written | 1,486,062 | 1,599,456
Net premiums written | 1,243,874 | 1,275,051
Net premiums earned | 993,130 | 867,834
Net claims and claim expenses incurred | 613,591 | 581,972
Acquisition expenses | 286,938 | 249,411
Operational expenses | 21,661 | 20,975
Underwriting income (loss) | 70,940 | 15,476
Net claims and claim expenses incurred – current accident year | 636,650 | 583,047
Net claims and claim expenses incurred – prior accident years | (23,059) | (1,075)
Total net incurred | $ 613,591 | $ 581,972
Net claims and claim expense ratio – current accident year | 64.10% | 67.20%
Net claims and claim expense ratio – prior accident years | (2.30%) | (0.10%)
Net claims and claim expense ratio – calendar year | 61.80% | 67.10%
Underwriting expense ratio | 31.10% | 31.10%
Combined ratio | 92.90% | 98.20%

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