Derivative Instruments and Hedging Activities Schedule of Credit Default Swaps, Receive Protection (Details) (USD $) In Thousands, unless otherwise specified									9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2014 Credit Default Swap, Buying Protection [Member]	Dec. 31, 2013 Credit Default Swap, Buying Protection [Member]	Sep. 30, 2014 Maturity Date, 06/20/2016 [Member] Credit Default Swap, Buying Protection [Member]	Dec. 31, 2013 Maturity Date, 06/20/2016 [Member] Credit Default Swap, Buying Protection [Member]	Sep. 30, 2014 Maturity Date, 12/20/2016 [Member] Credit Default Swap, Buying Protection [Member]	Dec. 31, 2013 Maturity Date, 12/20/2016 [Member] Credit Default Swap, Buying Protection [Member]	Dec. 31, 2013 Maturity Date, 12/20/2018 [Member] Credit Default Swap, Buying Protection [Member]	Dec. 31, 2013 Maturity Date, 05/25/2046 [Member] Credit Default Swap, Buying Protection [Member]
Derivative [Line Items]
Derivative, Maturity Date									Jun. 20, 2016	Jun. 20, 2016	Dec. 20, 2016	Dec. 20, 2016	Dec. 20, 2018	May 25, 2046
Derivative, Average Implied Credit Spread							183.60	329.13	105.50	105.50	496.00	496.00	393.31	356.00
Derivative, Notional Amount	$ (57,015,981)	$ (43,379,217)	$ (37,366,610)	$ (36,472,401)	$ (44,262,605)	$ (22,377,656)	$ (125,000)	$ (427,073)	$ (100,000)	$ (100,000)	$ (25,000)	$ (25,000)	$ (270,000)	$ (32,073)
Derivative, Fair Value, Net							(1,825)	(18,049)	(1,513)	(2,149)	(312)	(401)	(23,568)	8,069
Derivative, Cost							(4,322)	(6,510)	(260)	(260)	(4,062)	(4,062)	12,838	(15,026)
Derivative, Unrealized Gains (Losses)							$ (6,147)	$ (24,559)	$ (1,773)	$ (2,409)	$ (4,374)	$ (4,463)	$ (10,730)	$ (6,957)