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Derivative Instruments (Consolidated Balance Sheets And Fair Value Of The Principal Derivative Instruments) (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Other Assets |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | $ 3,079 | $ 10,635
Gross Amounts Offset in the Balance Sheet | 1,168 | 2,941
Net Amounts of Assets Presented in the Balance Sheet | 1,911 | 7,694
Collateral | 60 | 310
Net Amount | 1,851 | 7,384
Other Assets | Interest Rate Contracts |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 849 | 468
Gross Amounts Offset in the Balance Sheet | 743 | 468
Net Amounts of Assets Presented in the Balance Sheet | 106 | 0
Collateral | 0 | 0
Net Amount | 106 | 0
Other Assets | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 1,153 | 5,740
Gross Amounts Offset in the Balance Sheet | 133 | 1,737
Net Amounts of Assets Presented in the Balance Sheet | 1,020 | 4,003
Collateral | 0 | 0
Net Amount | 1,020 | 4,003
Other Assets | Foreign Currency Forward Contracts, Investment Operations |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 803 | 3,959
Gross Amounts Offset in the Balance Sheet | 157 | 648
Net Amounts of Assets Presented in the Balance Sheet | 646 | 3,311
Collateral | 0 | 0
Net Amount | 646 | 3,311
Other Assets | Credit Default Swaps |  |
Derivative Assets |  |
Gross Amounts of Recognized Assets | 274 | 468
Gross Amounts Offset in the Balance Sheet | 135 | 88
Net Amounts of Assets Presented in the Balance Sheet | 139 | 380
Collateral | 60 | 310
Net Amount | 79 | 70
Other Liabilities |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 8,045 | 3,521
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 2,052 | 2,172
Net Amounts of Liabilities Presented in the Balance Sheet | 5,993 | 1,349
Collateral | 143 | 759
Net Amount | 5,850 | 590
Other Liabilities | Interest Rate Contracts |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 872 | 1,037
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 743 | 468
Net Amounts of Liabilities Presented in the Balance Sheet | 129 | 569
Collateral | 129 | 569
Net Amount | 0 | 0
Other Liabilities | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 6,589 | 1,319
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 1,017 | 967
Net Amounts of Liabilities Presented in the Balance Sheet | 5,572 | 352
Collateral | 0 | 0
Net Amount | 5,572 | 352
Other Liabilities | Foreign Currency Forward Contracts, Investment Operations |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 320 | 724
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 157 | 649
Net Amounts of Liabilities Presented in the Balance Sheet | 163 | 75
Collateral | 0 | 0
Net Amount | 163 | 75
Other Liabilities | Credit Default Swaps |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 250 | 251
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 135 | 88
Net Amounts of Liabilities Presented in the Balance Sheet | 115 | 163
Collateral | 0 | 0
Net Amount | 115 | 163
Other Liabilities | Weather contract |  |
Derivative Liabilities |  |
Gross Amounts of Recognized Liabilities | 14 | 190
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 | 0
Net Amounts of Liabilities Presented in the Balance Sheet | 14 | 190
Collateral | 14 | 190
Net Amount | $ 0 | $ 0

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