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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)