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Financial Derivatives (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Derivative [Line Items]    
Low range of spread on written credit derivatives 0.25% 0.35%
High range of spread on written credit derivatives 5.00% 4.58%
Credit Default Swap, Selling Protection [Member]
   
Derivative [Line Items]    
Total net up-front payments received $ 2.5 $ 12.6