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Investments (Components 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]
Investment income, gross									$ 2,214,550	$ 2,329,478	$ 2,167,461
Less investment expenses									(32,472)	(21,843)	(19,649)
Net investment income	$ 521,725	$ 543,331	$ 543,704	$ 573,318	$ 588,217	$ 590,412	$ 570,568	$ 558,438	2,182,078	2,307,635	2,147,812
Available For Sale Fixed Maturity Securities
Net Investment Income [Line Items]
Investment income, gross									2,035,762	2,171,768	2,027,599
Equity Securities
Net Investment Income [Line Items]
Investment income, gross									1,090	4,083	4,735
Mortgage Loans on Real Estate
Net Investment Income [Line Items]
Investment income, gross									170,749	145,344	131,259
Cash and Cash Equivalents
Net Investment Income [Line Items]
Investment income, gross									4,871	5,164	2,320
Other
Net Investment Income [Line Items]
Investment income, gross									$ 2,078	$ 3,119	$ 1,548

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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Amount of expenses related to the generation of investment income.

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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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