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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