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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 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Other Assets |  |
Derivative Assets [Abstract] |  |
Gross Amounts of Recognized Assets | $ 6,968 | $ 10,635
Gross Amounts Offset in the Balance Sheet | 1,662 | 2,941
Net Amounts of Assets Presented in the Balance Sheet | 5,306 | 7,694
Collateral | 0 | 310
Net Amount | 5,306 | 7,384
Other Assets | Interest Rate Futures |  |
Derivative Assets [Abstract] |  |
Gross Amounts of Recognized Assets | 1,059 | 468
Gross Amounts Offset in the Balance Sheet | 937 | 468
Net Amounts of Assets Presented in the Balance Sheet | 122 | 0
Collateral | 0 | 0
Net Amount | 122 | 0
Other Assets | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |
Derivative Assets [Abstract] |  |
Gross Amounts of Recognized Assets | 4,645 | 5,740
Gross Amounts Offset in the Balance Sheet | 82 | 1,737
Net Amounts of Assets Presented in the Balance Sheet | 4,563 | 4,003
Collateral | 0 | 0
Net Amount | 4,563 | 4,003
Other Assets | Foreign Currency Forward Contracts, Investment Operations |  |
Derivative Assets [Abstract] |  |
Gross Amounts of Recognized Assets | 1,007 | 3,959
Gross Amounts Offset in the Balance Sheet | 599 | 648
Net Amounts of Assets Presented in the Balance Sheet | 408 | 3,311
Collateral | 0 | 0
Net Amount | 408 | 3,311
Other Assets | Credit Default Swaps |  |
Derivative Assets [Abstract] |  |
Gross Amounts of Recognized Assets | 257 | 468
Gross Amounts Offset in the Balance Sheet | 44 | 88
Net Amounts of Assets Presented in the Balance Sheet | 213 | 380
Collateral | 0 | 310
Net Amount | 213 | 70
Other Liabilities |  |
Derivative Liabilities [Abstract] |  |
Gross Amounts of Recognized Liabilities | 5,481 | 3,521
Gross Amounts Offset in the Balance Sheet | 1,661 | 2,172
Net Amounts of Liabilities Presented in the Balance Sheet | 3,820 | 1,349
Collateral | 1,803 | 759
Net Amount | 2,017 | 590
Other Liabilities | Interest Rate Futures |  |
Derivative Liabilities [Abstract] |  |
Gross Amounts of Recognized Liabilities | 2,293 | 1,037
Gross Amounts Offset in the Balance Sheet | 937 | 468
Net Amounts of Liabilities Presented in the Balance Sheet | 1,356 | 569
Collateral | 1,356 | 569
Net Amount | 0 | 0
Other Liabilities | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |
Derivative Liabilities [Abstract] |  |
Gross Amounts of Recognized Liabilities | 1,891 | 1,319
Gross Amounts Offset in the Balance Sheet | 81 | 967
Net Amounts of Liabilities Presented in the Balance Sheet | 1,810 | 352
Collateral | 0 | 0
Net Amount | 1,810 | 352
Other Liabilities | Foreign Currency Forward Contracts, Investment Operations |  |
Derivative Liabilities [Abstract] |  |
Gross Amounts of Recognized Liabilities | 806 | 724
Gross Amounts Offset in the Balance Sheet | 599 | 649
Net Amounts of Liabilities Presented in the Balance Sheet | 207 | 75
Collateral | 0 | 0
Net Amount | 207 | 75
Other Liabilities | Credit Default Swaps |  |
Derivative Liabilities [Abstract] |  |
Gross Amounts of Recognized Liabilities | 491 | 251
Gross Amounts Offset in the Balance Sheet | 44 | 88
Net Amounts of Liabilities Presented in the Balance Sheet | 447 | 163
Collateral | 447 | 0
Net Amount | $ 0 | 163
Other Liabilities | Weather Contract |  |
Derivative Liabilities [Abstract] |  |
Gross Amounts of Recognized Liabilities |  | 190
Gross Amounts Offset in the Balance Sheet |  | 0
Net Amounts of Liabilities Presented in the Balance Sheet |  | 190
Collateral |  | 190
Net Amount |  | $ 0

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