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Investments (Details 6) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Asset derivatives: |  |
Derivatives Asset, Net Amount | $ 4,325 | $ 2,501
Free-standing derivatives [Member] |  |
Asset derivatives: |  |
Derivatives Asset, Gross Amounts | 4,325 | 2,501
Derivatives Asset, Gross Amounts Offset in the Consolidated Balance Sheets | 0 | 0
Derivatives Asset, Net Amounts of Assets/Liabilities Presented in the Consolidated Balance Sheets | 4,325 | 2,501
Derivatives Asset, Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments | 0 | 0
Derivatives Asset, Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received | 3,081 | 2,617
Derivatives Asset, Net Amount | $ 1,244 | $ (116)

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