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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, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Gross premiums written | $ 2,025,721 | $ 1,564,295
Net premiums written | 1,269,808 | 929,031
Net premiums earned | 913,098 | 550,028
Net claims and claim expenses incurred | 570,954 | 227,035
Acquisition expenses | 210,604 | 123,951
Operational expenses | 67,461 | 44,933
Underwriting income (loss) | 64,079 | 154,109
Net investment income | 99,473 | 82,094
Net foreign exchange losses | (5,728) | (2,846)
Equity in earnings of other ventures | 4,564 | 4,661
Other loss | (4,436) | 3,171
Net realized and unrealized (losses) gains on investments | (110,707) | 170,013
Corporate expenses | (15,991) | (38,789)
Interest expense | (14,927) | (11,754)
Income before taxes | 16,327 | 360,659
Income tax benefit (expense) | 8,846 | (7,531)
Net income attributable to redeemable noncontrolling interests | (98,091) | (70,222)
Dividends on preference shares | (9,056) | (9,189)
Net (loss) income (attributable) available to RenaissanceRe common shareholders | (81,974) | 273,717
Net claims and claim expenses incurred – current accident year | 557,054 | 231,341
Net claims and claim expenses incurred – prior accident years | 13,900 | (4,306)
Total net incurred | $ 570,954 | $ 227,035
Net claims and claim expense ratio – current accident year | 61.00% | 42.10%
Net claims and claim expense ratio – prior accident years | 1.50% | (0.80%)
Net claims and claim expense ratio – calendar year | 62.50% | 41.30%
Underwriting expense ratio | 30.50% | 30.70%
Combined ratio | 93.00% | 72.00%
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 | (107) | 19
Acquisition expenses | 0 | 0
Operational expenses | 0 | 0
Underwriting income (loss) | 107 | (19)
Net investment income | 99,473 | 82,094
Net foreign exchange losses | (5,728) | (2,846)
Equity in earnings of other ventures | 4,564 | 4,661
Other loss | (4,436) | 3,171
Net realized and unrealized (losses) gains on investments | (110,707) | 170,013
Corporate expenses | (15,991) | (38,789)
Interest expense | (14,927) | (11,754)
Income tax benefit (expense) | 8,846 | (7,531)
Net income attributable to redeemable noncontrolling interests | (98,091) | (70,222)
Dividends on preference shares | (9,056) | (9,189)
Net claims and claim expenses incurred – current accident year | 0 | 0
Net claims and claim expenses incurred – prior accident years | (107) | 19
Total net incurred | (107) | 19
Property |  |
Segment Reporting Information [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | 14,008 | 1,877
Property | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Gross premiums written | 1,220,526 | 1,032,384
Net premiums written | 674,581 | 564,230
Net premiums earned | 421,335 | 290,745
Net claims and claim expenses incurred | 144,852 | 56,083
Acquisition expenses | 85,351 | 53,739
Operational expenses | 44,007 | 28,544
Underwriting income (loss) | 147,125 | 152,379
Net claims and claim expenses incurred – current accident year | 130,844 | 54,206
Net claims and claim expenses incurred – prior accident years | 14,008 | 1,877
Total net incurred | $ 144,852 | $ 56,083
Net claims and claim expense ratio – current accident year | 31.10% | 18.60%
Net claims and claim expense ratio – prior accident years | 3.30% | 0.70%
Net claims and claim expense ratio – calendar year | 34.40% | 19.30%
Underwriting expense ratio | 30.70% | 28.30%
Combined ratio | 65.10% | 47.60%
Casualty and Specialty |  |
Segment Reporting Information [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | $ (1) | $ (6,202)
Casualty and Specialty | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Gross premiums written | 805,195 | 531,911
Net premiums written | 595,227 | 364,801
Net premiums earned | 491,763 | 259,283
Net claims and claim expenses incurred | 426,209 | 170,933
Acquisition expenses | 125,253 | 70,212
Operational expenses | 23,454 | 16,389
Underwriting income (loss) | (83,153) | 1,749
Net claims and claim expenses incurred – current accident year | 426,210 | 177,135
Net claims and claim expenses incurred – prior accident years | (1) | (6,202)
Total net incurred | $ 426,209 | $ 170,933
Net claims and claim expense ratio – current accident year | 86.70% | 68.30%
Net claims and claim expense ratio – prior accident years | 0.00% | (2.40%)
Net claims and claim expense ratio – calendar year | 86.70% | 65.90%
Underwriting expense ratio | 30.20% | 33.40%
Combined ratio | 116.90% | 99.30%

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