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, 2011	Dec. 31, 2010	Dec. 31, 2009
Reserve For Losses, LAE And Future Policy Benefit Reserve [Abstract]
Gross basis: Beginning of period reserves	$ 554,790	$ 638,674	$ 786,843
Gross basis: Incurred losses	752
Gross basis: Paid losses	(55,631)	(83,884)	(148,169)
Gross basis: End of period reserves	499,911	554,790	638,674
Net basis: Beginning of period reserves	532,906	613,121	749,070
Net basis: Incurred losses	764		429
Net basis: Paid losses	(53,510)	(80,215)	(136,378)
Net basis: End of period reserves	$ 480,160	$ 532,906	$ 613,121