Segment Reporting (Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Underwriting gain (loss)	$ 196,886	$ (87,997)	$ 392,574	$ 20,330
Net investment income	179,028	141,322	320,004	279,616
Net realized capital gains (losses)	30,272	15,776	122,504	(9,125)
Net derivative gain (loss)	353	2,987	3,584	3,260
Corporate expenses	(7,535)	(6,633)	(14,187)	(15,629)
Interest, fee and bond issue cost amortization expense	(8,434)	(7,728)	(16,065)	(15,146)
Other income (expense)	(7,977)	3,036	(17,030)	15,100
INCOME (LOSS) BEFORE TAXES	$ 382,593	$ 60,763	$ 791,384	$ 278,406

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of the cost of borrowed funds accounted for as interest expense.

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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 net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations.

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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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