Fair Value Disclosures (Summary Of Amount By Which Contractual Principal Exceeds Fair Value For Loans And Other Receivables Measured At Fair Value Under Fair Value Option) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Loans and other receivables	$ 1,078,397	$ 1,325,938
Loans and other receivables on nonaccrual status	242,022	205,746
Long-term Debt	7,582	20,202
Loans and other receivables greater than 90 days past due	$ 68,500	$ 64,600