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	Dec. 31, 2016	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Loans and other receivables	$ 1,325,938	$ 408,369
Loans and other receivables on nonaccrual status and/or greater than 90 days past due	205,746	54,652
Long-term Debt	20,202	0
Loans and other receivables greater than 90 days past due	$ 64,600	$ 29,700