Unpaid Losses And Loss Adjustment Expenses (Reconciliation Of Consolidated A&E Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Net reserves for A&E losses and loss adjustment expenses, beginning of year	$ 104,661	$ 111,604	$ 132,869
Commutations and other	(305)	6,827	0
Adjusted net reserves for A&E losses and loss adjustment expenses, beginning of year		104,356	118,431	$ 132,869
Incurred losses and loss adjustment expenses	0	659	(5,277)
Payments	(21,308)	(14,429)	(15,988)
Net reserves for A&E losses and loss adjustment expenses, end of year	83,048	104,661	111,604
Reinsurance recoverable on unpaid losses	164,663	169,866	212,300
Gross reserves for A&E losses and loss adjustment expenses, end of year	$ 247,711	$ 274,527	$ 323,904