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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		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Underwriting gain (loss)	$ (27,539)			$ 278					$ 365,035	$ 20,608
Net investment income	181,058			161,363					501,062	440,979
Net realized capital gains (losses)	(12,943)			54,804					109,561	45,679
Net derivative gain (loss)	(189)			2,225					3,395	5,485
Corporate expenses	(8,435)			(7,890)					(22,622)	(23,519)
Interest, fee and bond issue cost amortization expense	(7,907)			(7,901)					(23,972)	(23,047)
Other income (expense)	(31,025)	$ (18,225)	$ (3,300)	(13,408)	$ (6,573)	$ 17,033	$ (21,525)	$ 10,460	(52,550)	(2,948)	$ (24,771)	$ (21,215)
INCOME (LOSS) BEFORE TAXES	$ 93,020	$ 372,345	$ 414,544	$ 189,471	$ 51,154	$ 222,612	$ 786,889	$ 273,766	$ 879,909	$ 463,237	$ (242,182)	$ 419,411

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