Fair Value Measurement (Summary Of Changes In Fair Value Of Level 3 Financial Assets And Financial Liabilities Held At Fair Value) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Partnership Interest In Private Credit Fund [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 13,745	$ 12,966	$ 11,719	$ 12,548
Realized (losses) gains included in earnings	2,049	296	2,910	(122)
Reclassification from other assets			2,911	0
Sales			0	0
Settlement	0	0	(24)	0
Ending Balance	11,696	12,670	11,696	12,670
The amount of total (losses) gains for the period included in earnings attributable to assets still held at September 30	$ (2,049)	(296)	$ (2,910)	122
Collateralized Debt Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance				4,302
Realized (losses) gains included in earnings				755
Reclassification from other assets				0
Sales				(3,547)
Settlement				0
Ending Balance		$ 0		0
The amount of total (losses) gains for the period included in earnings attributable to assets still held at September 30				$ 0