Fair Value Measurements (Schedule Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Level 3, beginning of period	$ 280,582		$ 32,062		$ 116,280		$ 32,814
Transfers out of Level 3	(248,844)	[1],[2]	0	[1],[2]	(248,844)	[1],[2]	(975)	[1],[2]
Change in unrealized loss included in other comprehensive income	1,643		(434)		7,000		692
Unrealized loss included in net income	(20)		98		(285)		(622)
Purchases/capital calls	109		0		159,412		126
Accretion/amortization	146		22		188		16
Calls/paydowns	(2,044)		(772)		(2,179)		(1,075)
Level 3, end of period	$ 31,572		$ 30,976		$ 31,572		$ 30,976

[1] As of January 1, 2012, auction rate preferred securities were transferred from Level 3 to Level 2. These securities are considered to be Level 2 based upon observable market activity at full par value for recent transactions.

[2] As of April 1, 2013, the CLO portfolio was transferred from Level 3 to Level 2 based on having more observable inputs in determining fair value. In prior quarters, the CLO portfolio was priced using average non-binding broker quotes. During the current quarter, the Company engaged a third-party pricing vendor to provide monthly fair value measurements. This methodology used is a combination of matrix pricing, observed market activity and metrics. Pricing inputs such as credit spreads are observable and market corroborated and, therefore, the CLO portfolio qualifies for Level 2 categorization. The market for these CLO's is an active market and there is ample price transparency.