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v3.20.4

Segment Reporting (Schedule of Gross Premiums Written Allocated to the Territory of Coverage Exposure) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) | $ 935,514 | $ 1,143,058 | $ 1,701,872 | $ 2,025,721 | $ 905,479 | $ 861,068 | $ 1,476,908 | $ 1,564,295 | $ 5,806,165 | $ 4,807,750 | $ 3,310,427
Property |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) |  |  |  |  |  |  |  |  | 2,999,142 | 2,430,985 | 1,760,926
Property | U.S. and Caribbean |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) |  |  |  |  |  |  |  |  | 1,683,538 | 1,368,205 | 978,063
Property | Worldwide |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) |  |  |  |  |  |  |  |  | 889,917 | 643,744 | 464,311
Property | Europe |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) |  |  |  |  |  |  |  |  | 189,587 | 182,544 | 144,857
Property | Japan |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) |  |  |  |  |  |  |  |  | 102,228 | 90,328 | 71,601
Property | Worldwide (excluding U.S.) |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) |  |  |  |  |  |  |  |  | 62,058 | 79,393 | 66,872
Property | Australia and New Zealand |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) |  |  |  |  |  |  |  |  | 40,243 | 32,203 | 19,273
Property | Other |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) |  |  |  |  |  |  |  |  | 31,571 | 34,568 | 15,949
Casualty and Specialty |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) |  |  |  |  |  |  |  |  | 2,807,023 | 2,376,765 | 1,549,501
Casualty and Specialty | U.S. and Caribbean |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) |  |  |  |  |  |  |  |  | 1,248,981 | 1,071,170 | 667,125
Casualty and Specialty | Worldwide |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) |  |  |  |  |  |  |  |  | 1,315,386 | 935,626 | 776,976
Casualty and Specialty | Europe |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) |  |  |  |  |  |  |  |  | 121,369 | 227,178 | 15,296
Casualty and Specialty | Worldwide (excluding U.S.) |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) |  |  |  |  |  |  |  |  | 56,225 | 25,291 | 31,734
Casualty and Specialty | Australia and New Zealand |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) |  |  |  |  |  |  |  |  | 12,429 | 34,053 | 3,667
Casualty and Specialty | Other |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written (Note 7) |  |  |  |  |  |  |  |  | $ 52,633 | $ 83,447 | $ 54,703

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