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) (Credit Default Swap, Buying Protection [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Derivative [Line Items]    
Derivative, Average Implied Credit Spread 183.60 329.13
Derivative, Notional Amount $ 125,000 $ 427,073
Derivative, Fair Value, Net (2,395) (18,049)
Derivative, Cost (4,322) (6,510)
Derivative, Unrealized Gains (Losses) (6,717) (24,559)
Maturity Date, 06/20/2016 [Member]
    
Derivative [Line Items]    
Derivative, Maturity Date Jun. 20, 2016 Jun. 20, 2016
Derivative, Average Implied Credit Spread 105.50 105.50
Derivative, Notional Amount 100,000 100,000
Derivative, Fair Value, Net (2,045) (2,149)
Derivative, Cost (260) (260)
Derivative, Unrealized Gains (Losses) (2,305) (2,409)
Maturity Date, 12/20/2016 [Member]
    
Derivative [Line Items]    
Derivative, Maturity Date Dec. 20, 2016 Dec. 20, 2016
Derivative, Average Implied Credit Spread 496.00 496.00
Derivative, Notional Amount 25,000 25,000
Derivative, Fair Value, Net (350) (401)
Derivative, Cost (4,062) (4,062)
Derivative, Unrealized Gains (Losses) (4,412) (4,463)
Maturity Date, 12/20/2018 [Member]
    
Derivative [Line Items]    
Derivative, Maturity Date   Dec. 20, 2018
Derivative, Average Implied Credit Spread   393.31
Derivative, Notional Amount   (270,000)
Derivative, Fair Value, Net   (23,568)
Derivative, Cost   12,838
Derivative, Unrealized Gains (Losses)   (10,730)
Maturity Date, 05/25/2046 [Member]
    
Derivative [Line Items]    
Derivative, Maturity Date   May 25, 2046
Derivative, Average Implied Credit Spread   356.00
Derivative, Notional Amount   32,073
Derivative, Fair Value, Net   8,069
Derivative, Cost   (15,026)
Derivative, Unrealized Gains (Losses)   $ (6,957)