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	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Gross basis: Beginning of period reserves	$ 476,205	$ 402,461	$ 442,821
Gross basis: Incurred losses	40,000	142,233	5,599
Gross basis: Paid losses	(83,088)	(68,489)	(45,959)
Gross basis: End of period reserves	433,117	476,205	402,461
Net basis: Beginning of period reserves	458,211	386,677	425,691
Net basis: Incurred losses	38,440	137,769	5,400
Net basis: Paid losses	(177,031)	(66,235)	(44,414)
Net basis: End of period reserves	$ 319,620	$ 458,211	$ 386,677