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Derivative Instruments (Consolidated Balance Sheets and Fair Value of the Principal Derivative Instruments) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative Assets |  |
Gross Amounts of Recognized Assets | $ 26,120 |
Gross Amounts Offset in the Balance Sheet | 513 |
Net Amounts of Assets Presented in the Balance Sheet | 25,607 |
Collateral | 0 |
Net Amount | 25,607 |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 8,468 |
Gross Amounts Offset in the Balance Sheet | 1,426 |
Net Amounts of Liabilities Presented in the Balance Sheet | 7,042 |
Collateral Pledged | 389 |
Net Amount | 6,653 |
Other assets |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets |  | $ 22,874
Gross Amounts Offset in the Balance Sheet |  | 3,944
Net Amounts of Assets Presented in the Balance Sheet |  | 18,930
Collateral |  | 0
Net Amount |  | 18,930
Other liabilities |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities |  | 8,225
Gross Amounts Offset in the Balance Sheet |  | 1,684
Net Amounts of Liabilities Presented in the Balance Sheet |  | 6,540
Collateral Pledged |  | 2,132
Net Amount |  | 4,408
Not Designated as Hedging Instrument | Other assets |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 25,048 |
Gross Amounts Offset in the Balance Sheet | 513 |
Net Amounts of Assets Presented in the Balance Sheet | 24,535 |
Collateral | 0 |
Net Amount | 24,535 |
Not Designated as Hedging Instrument | Other assets | Interest rate futures |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 175 | 971
Gross Amounts Offset in the Balance Sheet | 145 | 636
Net Amounts of Assets Presented in the Balance Sheet | 30 | 335
Collateral | 0 | 0
Net Amount | 30 | 335
Not Designated as Hedging Instrument | Other assets | Interest rate swaps |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 5 | 860
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Assets Presented in the Balance Sheet | 5 | 860
Collateral | 0 | 0
Net Amount | 5 | 860
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, underwriting and non-investment operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 21,822 | 16,459
Gross Amounts Offset in the Balance Sheet | 0 | 2,260
Net Amounts of Assets Presented in the Balance Sheet | 21,822 | 14,199
Collateral | 0 | 0
Net Amount | 21,822 | 14,199
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 1,105 | 3,194
Gross Amounts Offset in the Balance Sheet | 368 | 71
Net Amounts of Assets Presented in the Balance Sheet | 737 | 3,123
Collateral | 0 | 0
Net Amount | 737 | 3,123
Not Designated as Hedging Instrument | Other assets | Credit default swaps |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 209 |
Gross Amounts Offset in the Balance Sheet | 0 |
Net Amounts of Assets Presented in the Balance Sheet | 209 |
Collateral | 0 |
Net Amount | 209 |
Not Designated as Hedging Instrument | Other assets | Total return swaps |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 1,177 |
Gross Amounts Offset in the Balance Sheet | 0 |
Net Amounts of Assets Presented in the Balance Sheet | 1,177 |
Collateral | 0 |
Net Amount | 1,177 |
Not Designated as Hedging Instrument | Other assets | Equity futures |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 555 | 1,390
Gross Amounts Offset in the Balance Sheet | 0 | 977
Net Amounts of Assets Presented in the Balance Sheet | 555 | 413
Collateral | 0 | 0
Net Amount | 555 | 413
Not Designated as Hedging Instrument | Other liabilities |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 8,468 |
Gross Amounts Offset in the Balance Sheet | 1,010 |
Net Amounts of Liabilities Presented in the Balance Sheet | 7,458 |
Collateral Pledged | 389 |
Net Amount | 7,069 |
Not Designated as Hedging Instrument | Other liabilities | Interest rate futures |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 518 | 910
Gross Amounts Offset in the Balance Sheet | 145 | 636
Net Amounts of Liabilities Presented in the Balance Sheet | 373 | 273
Collateral Pledged | 373 | 273
Net Amount | 0 | 0
Not Designated as Hedging Instrument | Other liabilities | Interest rate swaps |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 16 | 506
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 16 | 506
Collateral Pledged | 16 | 254
Net Amount | 0 | 252
Not Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, underwriting and non-investment operations |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 6,676 | 4,154
Gross Amounts Offset in the Balance Sheet | 497 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 6,179 | 4,154
Collateral Pledged | 0 | 0
Net Amount | 6,179 | 4,154
Not Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 1,078 | 72
Gross Amounts Offset in the Balance Sheet | 368 | 71
Net Amounts of Liabilities Presented in the Balance Sheet | 710 | 1
Collateral Pledged | 0 | 0
Net Amount | 710 | 1
Not Designated as Hedging Instrument | Other liabilities | Credit default swaps |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities |  | 1,606
Gross Amounts Offset in the Balance Sheet |  | 0
Net Amounts of Liabilities Presented in the Balance Sheet |  | 1,606
Collateral Pledged |  | 1,605
Net Amount |  | 1
Not Designated as Hedging Instrument | Other liabilities | Total return swaps |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 180 |
Gross Amounts Offset in the Balance Sheet | 0 |
Net Amounts of Liabilities Presented in the Balance Sheet | 180 |
Collateral Pledged | 0 |
Net Amount | 180 |
Not Designated as Hedging Instrument | Other liabilities | Equity futures |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities |  | 977
Gross Amounts Offset in the Balance Sheet |  | 977
Net Amounts of Liabilities Presented in the Balance Sheet |  | 0
Collateral Pledged |  | 0
Net Amount |  | $ 0
Designated as Hedging Instrument |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 1,072 |
Gross Amounts Offset in the Balance Sheet | 0 |
Net Amounts of Assets Presented in the Balance Sheet | 1,072 |
Collateral | 0 |
Net Amount | 1,072 |
Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 1,072 |
Gross Amounts Offset in the Balance Sheet | 0 |
Net Amounts of Assets Presented in the Balance Sheet | 1,072 |
Collateral | 0 |
Net Amount | 1,072 |
Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 0 |
Gross Amounts Offset in the Balance Sheet | 416 |
Net Amounts of Liabilities Presented in the Balance Sheet | (416) |
Collateral Pledged | 0 |
Net Amount | $ (416) |

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