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Investments (Schedule of Investments in Other Ventures, under Equity Method) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Carrying  Value	$ 98,068	$ 98,373
Tower Hill Companies
Schedule of Equity Method Investments [Line Items]
Carrying  Value	$ 25,575	$ 30,470
Tower Hill Companies | Low
Schedule of Equity Method Investments [Line Items]
Ownership %	2.00%	2.00%
Tower Hill Companies | High
Schedule of Equity Method Investments [Line Items]
Ownership %	25.00%	25.00%
Top Layer Re
Schedule of Equity Method Investments [Line Items]
Ownership %	50.00%	50.00%
Carrying  Value	$ 25,903	$ 26,958
Other
Schedule of Equity Method Investments [Line Items]
Ownership %	22.40%	25.00%
Carrying  Value	$ 46,590	$ 40,945

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-Name Accounting Standards Codification
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