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Investments - Offsetting of Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Asset derivatives |  |
Net Amounts of Assets/Liabilities Presented in the Consolidated Balance Sheets | $ 13,240 | $ 2,647
Free-standing derivatives |  |
Asset derivatives |  |
Gross Amounts | 13,239 | 2,647
Gross Amounts Offset in the Consolidated Balance Sheets | 0 | 0
Net Amounts of Assets/Liabilities Presented in the Consolidated Balance Sheets | 13,239 | 2,647
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments | 7,687 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received | 6,640 | 1,868
Derivative Asset, Fair Value, Amount Offset Against Collateral | $ (1,088) | $ 779

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