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Investments (Components of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Investment Income [Line Items]
Investment income, gross									$ 2,329,478	$ 2,167,461	$ 2,006,621
Less investment expenses									(21,843)	(19,649)	(14,624)
Net investment income	$ 588,217	$ 590,412	$ 570,568	$ 558,438	$ 554,355	$ 549,391	$ 533,282	$ 510,784	2,307,635	2,147,812	1,991,997
Fixed Maturity Securities
Net Investment Income [Line Items]
Investment income, gross									2,171,768	2,027,599	1,876,542
Equity Securities
Net Investment Income [Line Items]
Investment income, gross									4,083	4,735	764
Mortgage Loans on Real Estate
Net Investment Income [Line Items]
Investment income, gross									145,344	131,259	122,680
Cash and Cash Equivalents
Net Investment Income [Line Items]
Investment income, gross									5,164	2,320	2,562
Other
Net Investment Income [Line Items]
Investment income, gross									$ 3,119	$ 1,548	$ 4,073

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, 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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