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Derivative Instruments (Consolidated Balance Sheets And Fair Value Of The Principal Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Derivative Assets |  |  |  |
Gross Amounts of Recognized Assets | $ 9,985 |  | $ 12,328 |
Gross Amounts Offset in the Balance Sheet | 1,244 |  | 1,661 |
Net Amounts of Assets Presented in the Balance Sheet | 8,741 |  | 10,667 |
Collateral | 570 |  | 310 |
Net Amount | 8,171 |  | 10,357 |
Derivative Liabilities |  |  |  |
Gross Amounts of Recognized Liabilities | 13,607 |  | 6,419 |
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 3,398 |  | 510 |
Net Amounts of Liabilities Presented in the Balance Sheet | 10,209 |  | 5,909 |
Collateral | 257 |  | 2,502 |
Net Amount | 9,952 |  | 3,407 |
Other Assets | Interest Rate Contracts |  |  |  |
Derivative Assets |  |  |  |
Gross Amounts of Recognized Assets | 674 |  | 897 |
Gross Amounts Offset in the Balance Sheet | 192 |  | 62 |
Net Amounts of Assets Presented in the Balance Sheet | 482 |  | 835 |
Collateral | 0 |  | 0 |
Net Amount | 482 |  | 835 |
Other Assets | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |  |  |
Derivative Assets |  |  |  |
Gross Amounts of Recognized Assets | 6,449 | [1] | 9,612 | [1]
Gross Amounts Offset in the Balance Sheet | 519 | [1] | 1,179 | [1]
Net Amounts of Assets Presented in the Balance Sheet | 5,930 | [1] | 8,433 | [1]
Collateral | 0 | [1] | 0 | [1]
Net Amount | 5,930 | [1] | 8,433 | [1]
Other Assets | Foreign Currency Forward Contracts, Investment Operations |  |  |  |
Derivative Assets |  |  |  |
Gross Amounts of Recognized Assets | 1,916 | [2] | 1,013 | [2]
Gross Amounts Offset in the Balance Sheet | 454 | [2] | 338 | [2]
Net Amounts of Assets Presented in the Balance Sheet | 1,462 | [2] | 675 | [2]
Collateral | 0 | [2] | 0 | [2]
Net Amount | 1,462 | [2] | 675 | [2]
Other Assets | Credit Default Swaps |  |  |  |
Derivative Assets |  |  |  |
Gross Amounts of Recognized Assets | 682 |  | 806 |
Gross Amounts Offset in the Balance Sheet | 79 |  | 82 |
Net Amounts of Assets Presented in the Balance Sheet | 603 |  | 724 |
Collateral | 570 |  | 310 |
Net Amount | 33 |  | 414 |
Other Assets | Call Rights |  |  |  |
Derivative Assets |  |  |  |
Gross Amounts of Recognized Assets | 264 |  |  |
Gross Amounts Offset in the Balance Sheet | 0 |  |  |
Net Amounts of Assets Presented in the Balance Sheet | 264 |  |  |
Collateral | 0 |  |  |
Net Amount | 264 |  |  |
Other Liabilities | Interest Rate Contracts |  |  |  |
Derivative Liabilities |  |  |  |
Gross Amounts of Recognized Liabilities | 195 |  | 74 |
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 192 |  | 62 |
Net Amounts of Liabilities Presented in the Balance Sheet | 3 |  | 12 |
Collateral | 3 |  | 12 |
Net Amount | 0 |  | 0 |
Other Liabilities | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |  |  |
Derivative Liabilities |  |  |  |
Gross Amounts of Recognized Liabilities | 12,592 | [1] | 2,204 | [1]
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 2,673 | [1] | 28 | [1]
Net Amounts of Liabilities Presented in the Balance Sheet | 9,919 | [1] | 2,176 | [1]
Collateral | 0 | [1] | 0 | [1]
Net Amount | 9,919 | [1] | 2,176 | [1]
Other Liabilities | Foreign Currency Forward Contracts, Investment Operations |  |  |  |
Derivative Liabilities |  |  |  |
Gross Amounts of Recognized Liabilities | 469 | [2] | 1,557 | [2]
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 454 | [2] | 338 | [2]
Net Amounts of Liabilities Presented in the Balance Sheet | 15 | [2] | 1,219 | [2]
Collateral | 0 | [2] | 0 | [2]
Net Amount | 15 | [2] | 1,219 | [2]
Other Liabilities | Credit Default Swaps |  |  |  |
Derivative Liabilities |  |  |  |
Gross Amounts of Recognized Liabilities | 97 |  | 94 |
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 79 |  | 82 |
Net Amounts of Liabilities Presented in the Balance Sheet | 18 |  | 12 |
Collateral | 0 |  | 0 |
Net Amount | 18 |  | 12 |
Other Liabilities | Weather Contract |  |  |  |
Derivative Liabilities |  |  |  |
Gross Amounts of Recognized Liabilities | 254 |  | 2,490 |
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 |  | 0 |
Net Amounts of Liabilities Presented in the Balance Sheet | 254 |  | 2,490 |
Collateral | 254 |  | 2,490 |
Net Amount | $ 0 |  | $ 0 |
[1] | Contracts used to manage foreign currency risks in underwriting and non-investment operations.
[2] | Contracts used to manage foreign currency risks in investment operations.

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