Fair Value Measurement (Summary Of Changes In Fair Value Of Level 3 Financial Assets And Financial Liabilities Held At Fair Value) (Details) - Partnership Interest In Private Credit Fund [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 8,972	$ 13,745	$ 10,431	$ 11,719
Realized gains (losses) included in earnings	564	(2,049)	(895)	(2,910)
Reclassification from other assets			0	2,911
Settlements	0	0	0	(24)
Ending Balance	9,536	11,696	9,536	11,696
The amount of total (losses) gains for the period included in earnings attributable to assets still held at September 30	$ 564	$ (2,049)	$ (895)	$ (2,910)