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, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Collateralized Debt Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 0	$ 38,992	$ 4,302	$ 42,801
Realized (losses) gains included in earnings	0	5,616	(755)	5,993
Sales			(3,547)	(4,186)
Settlements	0	(8,264)	0	(8,264)
Ending Balance	0	36,344	0	36,344
The amount of total gains for the period included in earnings attributable to assets still held at September 30	0	5,616	0	6,510
Partnership Interest In Private Credit Fund [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	12,966	11,990	12,548	11,306
Realized (losses) gains included in earnings	(296)	134	122	818
Sales			0	0
Settlements	0	0	0	0
Ending Balance	12,670	12,124	12,670	12,124
The amount of total gains for the period included in earnings attributable to assets still held at September 30	$ (296)	$ 134	$ 122	$ 818