Premiums And Accounts Receivable (Schedule Of Allowance For Uncollectible Amounts) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Premiums Receivable Disclosure [Abstract]
Insurance premiums receivable	$ 1,092,136	$ 1,275,440
Other receivables	196,277	201,758
Allowance for uncollectible amounts	(27,696)	(31,568)
Total	$ 1,260,717	$ 1,445,630