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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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Underwriting gain (loss)	$ 273,639	$ 50,943	$ 318,843	$ 79,535
Net investment income	407,095	38,083	667,508	185,883
Net realized capital gains (losses)	104,109	184,648	143,011	(25,940)
Corporate expenses	(16,168)	(8,733)	(28,546)	(18,566)
Interest, fee and bond issue cost amortization expense	(15,607)	(7,253)	(31,246)	(14,836)
Other income (expense)	7,114	(20,621)	63,707	(12,631)
INCOME (LOSS) BEFORE TAXES	$ 760,181	$ 237,067	$ 1,133,276	$ 193,445

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