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, 2014	Dec. 31, 2013	Dec. 31, 2012
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Gross basis: Beginning of period reserves	$ 402,461	$ 442,821	$ 499,911
Gross basis: Incurred losses	142,233	5,599	132
Gross basis: Paid losses	(68,489)	(45,959)	(57,222)
Gross basis: End of period reserves	476,205	402,461	442,821
Net basis: Beginning of period reserves	386,677	425,691	480,160
Net basis: Incurred losses	137,769	5,400	124
Net basis: Paid losses	(66,235)	(44,414)	(54,593)
Net basis: End of period reserves	$ 458,211	$ 386,677	$ 425,691