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Segment Reporting (Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes) (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
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Underwriting gain (loss)									$ (253,811)	$ 336,163	$ (610,275)
Net Investment Income	$ 222,349	$ 234,233	$ 38,083	$ 147,800	$ 146,077	$ 181,058	$ 179,028	$ 140,976	642,465	647,139	581,183
Net realized capital gains (losses)	$ 183,386	$ 110,203	$ 184,648	$ (210,588)	$ 75,443	$ (12,943)	$ 30,272	$ 92,232	267,649	185,004	(127,136)
Corporate expenses									(41,118)	(32,966)	(30,672)
Interest, fee and bond issue cost amortization expense									(36,323)	(31,693)	(31,031)
Other income (expense)									6,487	(4,660)	(24,251)
INCOME (LOSS) BEFORE TAXES									$ 585,349	$ 1,098,987	$ (242,182)

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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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The difference between the price paid by the public and the contract price less the related expenses. A broker-dealer may underwrite a security offering by contracting to buy the issue either at a fixed price or a price based on selling the offering on a best-effort basis.

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