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Investments (Schedule of Investments in Other Ventures, under Equity Method) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Carrying  Value	$ 98,373	$ 106,549
Tower Hill Companies
Schedule of Equity Method Investments [Line Items]
Carrying  Value	$ 30,470	$ 36,779
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	$ 26,958	$ 35,363
Other
Schedule of Equity Method Investments [Line Items]
Ownership %	25.00%	26.60%
Carrying  Value	$ 40,945	$ 34,407

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ 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
-Section 50
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
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- Definition

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