Losses And Loss Adjustment Expenses (Activity In The Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves at January 1	$ 1,091,797	$ 1,038,984	$ 1,036,123
Less reinsurance recoverable	(14,546)	(14,484)	(13,927)	$ (12,155)
Net reserves at January 1	1,077,313	1,025,057	1,023,968
Acquisition of WAIC reserves	18,676	0	0
Incurred losses and loss adjustment expense related to:
Current year	2,132,837	1,989,315	1,959,730
Prior years	(12,658)	3,193	(2,960)
Total incurred losses and loss adjustment expenses	2,145,495	1,986,122	1,962,690
Loss and loss adjustment expense payments related to:
Current year	1,455,245	1,347,967	1,354,074
Prior years	654,097	585,899	607,527
Total payments	2,109,342	1,933,866	1,961,601
Net reserves at year-end	1,132,142	1,077,313	1,025,057
Reinsurance recoverable	14,546	14,484	13,927
Gross reserves at year-end	$ 1,146,688	$ 1,091,797	$ 1,038,984