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Derivative Financial Instruments and Hedging Table of Derivatives subject to netting agreement (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Derivative [Line Items]    
Derivative assets $ 37,661 $ 44,806
Credit Default Swap, Selling Protection | Credit Default Swap    
Derivative [Line Items]    
Gross assets recognized 31,948 41,126
Credit Default Swap, Buying Protection | Credit Default Swap    
Derivative [Line Items]    
Gross assets recognized 18,210 27,549
Credit Index Product | Credit Default Swap    
Derivative [Line Items]    
Gross assets recognized 13,738 13,577
Collateral payable (1,632) (1,632)
Derivative assets $ 12,106 $ 11,945