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Derivative Instruments (Consolidated Balance Sheets And Fair Value Of The Principal Derivative Instruments) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Other Assets |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | $ 11,081 | $ 4,208
Gross Amounts Offset in the Balance Sheet | 1,627 | 1,705
Net Amounts of Assets Presented in the Balance Sheet | 9,454 | 2,503
Collateral | 0 | 0
Net Amount | 9,454 | 2,503
Other Assets | Interest Rate Futures |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 1,277 | 1,384
Gross Amounts Offset in the Balance Sheet | 973 | 1,235
Net Amounts of Assets Presented in the Balance Sheet | 304 | 149
Collateral | 0 | 0
Net Amount | 304 | 149
Other Assets | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 7,245 | 774
Gross Amounts Offset in the Balance Sheet | 617 | 0
Net Amounts of Assets Presented in the Balance Sheet | 6,628 | 774
Collateral | 0 | 0
Net Amount | 6,628 | 774
Other Assets | Foreign Currency Forward Contracts, Investment Operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 57 | 621
Gross Amounts Offset in the Balance Sheet | 18 | 447
Net Amounts of Assets Presented in the Balance Sheet | 39 | 174
Collateral | 0 | 0
Net Amount | 39 | 174
Other Assets | Credit Default Swaps |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 2,502 | 1,429
Gross Amounts Offset in the Balance Sheet | 19 | 23
Net Amounts of Assets Presented in the Balance Sheet | 2,483 | 1,406
Collateral | 0 | 0
Net Amount | 2,483 | 1,406
Other Liabilities |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 4,073 | 13,527
Gross Amounts Offset in the Balance Sheet | 1,010 | 2,102
Net Amounts of Liabilities Presented in the Balance Sheet | 3,063 | 11,425
Collateral Pledged | 94 | 789
Net Amount | 2,969 | 10,636
Other Liabilities | Interest Rate Futures |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 1,067 | 2,030
Gross Amounts Offset in the Balance Sheet | 973 | 1,235
Net Amounts of Liabilities Presented in the Balance Sheet | 94 | 795
Collateral Pledged | 94 | 789
Net Amount | 0 | 6
Other Liabilities | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 2,273 | 10,550
Gross Amounts Offset in the Balance Sheet | 0 | 397
Net Amounts of Liabilities Presented in the Balance Sheet | 2,273 | 10,153
Collateral Pledged | 0 | 0
Net Amount | 2,273 | 10,153
Other Liabilities | Foreign Currency Forward Contracts, Investment Operations |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 97 | 766
Gross Amounts Offset in the Balance Sheet | 18 | 447
Net Amounts of Liabilities Presented in the Balance Sheet | 79 | 319
Collateral Pledged | 0 | 0
Net Amount | 79 | 319
Other Liabilities | Credit Default Swaps |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 636 | 181
Gross Amounts Offset in the Balance Sheet | 19 | 23
Net Amounts of Liabilities Presented in the Balance Sheet | 617 | 158
Collateral Pledged | 0 | 0
Net Amount | $ 617 | $ 158

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