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Investments (Schedule of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	$ 93,121	$ 122,830	$ 197,374	$ 209,032
Investment expenses	(3,816)	(4,242)	(8,596)	(8,350)
Net investment income	89,305	118,588	188,778	200,682
Fixed maturity investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	69,943	88,106	143,281	149,589
Short term investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	6,049	17,807	18,141	29,651
Equity investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	1,666	916	3,217	1,943
Catastrophe bonds
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	13,519	11,781	27,658	20,472
Other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	1,107	1,914	2,736	3,554
Cash and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	$ 837	$ 2,306	$ 2,341	$ 3,823

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
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
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Amount of expenses related to the generation of investment income.

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-Topic 220
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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.

+ References

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