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Investments - Offsetting of Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Asset derivatives: |  |
Net Amounts of Assets/Liabilities Presented in the Consolidated Balance Sheets | $ 2,647 | $ 15,550
Free-standing derivatives |  |
Asset derivatives: |  |
Gross Amounts | 2,647 | 15,550
Gross Amounts Offset in the Consolidated Balance Sheets | 0 | 0
Net Amounts of Assets/Liabilities Presented in the Consolidated Balance Sheets | 2,647 | 15,550
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments | 0 | 0
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received | 1,868 | 15,584
Net Amount | $ 779 | $ (34)

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