Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities Schedule of Credit Default Swaps, Receive Protection (Details)

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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)