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Segment Reporting (Schedule of Gross Premiums Written Allocated to the Territory of Coverage Exposure) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | $ 7,833,798 | $ 5,806,165 | $ 4,807,750
Property |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | 3,958,724 | 2,999,142 | 2,430,985
Property | U.S. and Caribbean |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | 2,257,088 | 1,683,538 | 1,368,205
Property | Worldwide |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | 1,188,737 | 889,917 | 643,744
Property | Europe |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | 253,678 | 189,587 | 182,544
Property | Japan |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | 114,981 | 102,228 | 90,328
Property | Worldwide (excluding U.S.) |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | 34,742 | 62,058 | 79,393
Property | Australia and New Zealand |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | 69,188 | 40,243 | 32,203
Property | Other |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | 40,310 | 31,571 | 34,568
Casualty and Specialty |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | 3,875,074 | 2,807,023 | 2,376,765
Casualty and Specialty | U.S. and Caribbean |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | 1,721,663 | 1,248,981 | 1,071,170
Casualty and Specialty | Worldwide |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | 1,746,450 | 1,315,386 | 935,626
Casualty and Specialty | Europe |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | 217,721 | 121,369 | 227,178
Casualty and Specialty | Worldwide (excluding U.S.) |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | 108,376 | 56,225 | 25,291
Casualty and Specialty | Australia and New Zealand |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | 29,001 | 12,429 | 34,053
Casualty and Specialty | Other |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written (Note 7) | $ 51,863 | $ 52,633 | $ 83,447

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