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Quarterly Financial Information (Unaudited) (Summary Of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Data [Abstract]
Net premiums earned	$ 868,233	$ 858,135	$ 833,959	$ 808,084	$ 806,796	$ 801,205	$ 797,666	$ 789,770	$ 3,368,411	$ 3,195,437	$ 3,131,773
Change in fair value of financial instruments pursuant to the fair value option	(70,020)	(12,907)	8,793	(58,532)	28,065	17,608	20,275	21,857	(132,658)	87,927	(32,805)
(Loss) income before income taxes	(114,448)	70,286	73,246	(59,699)	9,487	58,247	68,752	30,599	(30,615)	167,085	70,724
Net (loss) income	$ (81,879)	$ 58,578	$ 60,180	$ (42,607)	$ 19,779	$ 46,485	$ 51,633	$ 26,980	$ (5,728)	$ 144,877	$ 73,044
Basic (loss) earnings per share (in dollars per share)	$ (1.48)	$ 1.06	$ 1.09	$ (0.77)	$ 0.36	$ 0.84	$ 0.93	$ 0.49	$ (0.10)	$ 2.62	$ 1.32
Diluted (loss) earnings per share (in dollars per share)	(1.48)	1.06	1.09	(0.77)	0.36	0.84	0.93	0.49	(0.10)	2.62	$ 1.32
Dividends paid per share (in dollars per share)	$ 0.6275	$ 0.6250	$ 0.6250	$ 0.6250	$ 0.625	$ 0.6225	$ 0.6225	$ 0.6225	$ 0.6275	$ 0.625

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