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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
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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

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