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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Collateralized Debt Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 0	$ 39,723	$ 4,302	$ 42,801
Realized (losses) gains included in earnings	0	(731)	(755)	377
Sales			(3,547)	(4,186)
Ending Balance	0	38,992	0	38,992
The amount of total gains for the period included in earnings attributable to assets still held at June 30	0	(731)	0	894
Partnership Interest In Private Credit Fund [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	12,726	11,592	12,548	11,306
Realized (losses) gains included in earnings	240	398	418	684
Sales			0	0
Ending Balance	12,966	11,990	12,966	11,990
The amount of total gains for the period included in earnings attributable to assets still held at June 30	$ 240	$ 398	$ 418	$ 684