Reserve For Losses, LAE And Future Policy Benefit Reserve (Summary Of Incurred Losses With Respect To A&E Reserves On Both Gross And Net Of Reinsurance Basis) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reserve For Losses And LAE [Abstract]
Gross basis: Beginning of period reserves	$ 499,911	$ 554,790	$ 638,674
Gross basis: Incurred losses	132	753
Gross basis: Paid losses	(57,222)	(55,632)	(83,884)
Gross basis: End of period reserves	442,821	499,911	554,790
Net basis: Beginning of period reserves	341,251	382,507	430,421
Net basis: Incurred losses	17	(30)	(300)
Net basis: Paid losses	(35,799)	(41,226)	(47,614)
Net basis: End of period reserves	$ 305,469	$ 341,251	$ 382,507