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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
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Underwriting gain (loss)	$ 45,204	$ 28,592
Net investment income	260,413	147,800
Net realized capital gains (losses)	38,902	(210,588)
Corporate expenses	(12,378)	(9,833)
Interest, fee and bond issue cost amortization expense	(15,639)	(7,583)
Other income (expense)	56,593	7,990
Income (loss) before taxes	$ 373,095	$ (43,622)

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