Losses And Loss Adjustment Expenses (Activity In The Reserves For Losses And Loss Adjustment Expenses) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Insurance Loss Reserves [Abstract]
Gross reserves at January 1	$ 1,036,123,000	$ 985,279,000	$ 1,034,205,000
Less reinsurance recoverable	(13,927,000)	(12,155,000)	(7,921,000)	(6,805,000)
Net reserves at January 1	1,023,968,000	977,358,000	1,027,400,000
Incurred losses and loss adjustment expense related to:
Current year	1,959,730,000	1,919,116,000	1,810,711,000
Prior years	2,960,000	42,332,000	18,494,000
Increase in provision for insured events	3,000,000		18,000,000
Total incurred losses and loss adjustment expenses	1,962,690,000	1,961,448,000	1,829,205,000
Loss and loss adjustment expense payments related to:
Current year	1,354,074,000	1,314,748,000	1,265,188,000
Prior years	607,527,000	600,090,000	614,059,000
Total payments	1,961,601,000	1,914,838,000	1,879,247,000
Net reserves at year-end	1,025,057,000	1,023,968,000	977,358,000
Reinsurance recoverable	13,927,000	12,155,000	7,921,000	6,805,000
Gross reserves at year-end	$ 1,038,984,000	$ 1,036,123,000	$ 985,279,000