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Investments (Schedule of Net Investment Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net Investment Income [Line Items]
Gross investment income	$ 340,229	$ 372,593	$ 441,852
Investment expenses	(20,750)	(18,555)	(17,645)
Net investment income	319,479	354,038	424,207
Fixed maturity investments
Net Investment Income [Line Items]
Gross investment income	234,911	278,215	318,503
Short term investments
Net Investment Income [Line Items]
Gross investment income	2,333	20,799	56,264
Equity investments
Net Investment Income [Line Items]
Gross investment income	9,017	6,404	4,808
Catastrophe bonds
Net Investment Income [Line Items]
Gross investment income	64,860	54,784	46,154
Other
Net Investment Income [Line Items]
Gross investment income	28,811	9,417	8,447
Cash and cash equivalents
Net Investment Income [Line Items]
Gross investment income	$ 297	$ 2,974	$ 7,676

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.

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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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