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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

X

- Definition

Amount of direct and assumed premiums written.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

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