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Investments (Schedule of Net Investment Income) (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
Net Investment Income [Line Items]
Gross investment income									$ 372,593	$ 441,852	$ 284,879
Investment expenses									(18,555)	(17,645)	(14,914)
Net investment income	$ 81,717	$ 83,543	$ 89,305	$ 99,473	$ 112,138	$ 111,388	$ 118,587	$ 82,094	354,038	424,207	269,965
Fixed maturity investments
Net Investment Income [Line Items]
Gross investment income									278,215	318,503	211,973
Short term investments
Net Investment Income [Line Items]
Gross investment income									20,799	56,264	33,571
Equity investments
Net Investment Income [Line Items]
Gross investment income									6,404	4,808	4,474
Catastrophe bonds
Net Investment Income [Line Items]
Gross investment income									54,784	46,154	31,051
Other
Net Investment Income [Line Items]
Gross investment income									9,417	8,447	0
Cash and cash equivalents
Net Investment Income [Line Items]
Gross investment income									$ 2,974	$ 7,676	$ 3,810

X

- Definition

Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

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-Publisher FASB
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-Paragraph 1
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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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