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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