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Fair Value Measurements (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Summary of information about the described model inputs used to determine the fair value of each class of credit derivative
Notional outstanding	$ 12,884,416	$ 14,166,612
CVA percentage	65.00%	75.00%
CLOs [Member]
Summary of information about the described model inputs used to determine the fair value of each class of credit derivative
Notional outstanding	7,586,414	8,228,577
Weighted average reference obligation price	$ 94.6	$ 92.5
Weighted average life (WAL) in years	2 years 3 months 18 days	2 years 8 months 12 days
Weighted average credit rating	AA-	AA-
Weighted average relative change ratio	34.40%	34.40%
CVA percentage	65.00%	75.00%
Fair value of derivative liabilities	(51,166)	(54,320)
Other [Member]
Summary of information about the described model inputs used to determine the fair value of each class of credit derivative
Notional outstanding	3,681,319	4,099,766
Weighted average reference obligation price	$ 84.6	$ 84.3
Weighted average life (WAL) in years	4 years 8 months 12 days	4 years 8 months 12 days
Weighted average credit rating	A	A
Weighted average relative change ratio	38.30%	38.50%
CVA percentage	65.00%	75.00%
Fair value of derivative liabilities	$ (105,411)	$ (86,526)