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Derivative Instruments (Consolidated Balance Sheets And Fair Value Of The Principal Derivative Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivative Assets    
Gross Amounts of Recognized Assets $ 12,234 $ 12,328
Gross Amounts Offset in the Balance Sheet 5,606 1,661
Net Amounts of Assets Presented in the Balance Sheet 6,628 10,667
Collateral 495 310
Net Amount 6,133 10,357
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 2,266 6,419
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 428 510
Net Amounts of Liabilities Presented in the Balance Sheet 1,838 5,909
Collateral 79 12
Net Amount 1,759 5,897
Other Assets | Interest Rate Contracts
    
Derivative Assets    
Gross Amounts of Recognized Assets 855 897
Gross Amounts Offset in the Balance Sheet 100 62
Net Amounts of Assets Presented in the Balance Sheet 755 835
Collateral 0 0
Net Amount 755 835
Other Assets | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations
    
Derivative Assets    
Gross Amounts of Recognized Assets 10,184 [1] 9,612 [1]
Gross Amounts Offset in the Balance Sheet 5,178 [1] 1,179 [1]
Net Amounts of Assets Presented in the Balance Sheet 5,006 [1] 8,433 [1]
Collateral 0 [1] 0 [1]
Net Amount 5,006 [1] 8,433 [1]
Other Assets | Foreign Currency Forward Contracts, Investment Operations
    
Derivative Assets    
Gross Amounts of Recognized Assets 360 [2] 1,013 [2]
Gross Amounts Offset in the Balance Sheet 283 [2] 338 [2]
Net Amounts of Assets Presented in the Balance Sheet 77 [2] 675 [2]
Collateral 0 [2] 0 [2]
Net Amount 77 [2] 675 [2]
Other Assets | Credit Default Swaps
    
Derivative Assets    
Gross Amounts of Recognized Assets 835 806
Gross Amounts Offset in the Balance Sheet 45 82
Net Amounts of Assets Presented in the Balance Sheet 790 724
Collateral 495 310
Net Amount 295 414
Other Liabilities | Interest Rate Contracts
    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 179 74
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 100 62
Net Amounts of Liabilities Presented in the Balance Sheet 79 12
Collateral 79 12
Net Amount 0 0
Other Liabilities | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations
    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 8 [1] 2,204 [1]
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0 [1] 28 [1]
Net Amounts of Liabilities Presented in the Balance Sheet 8 [1] 2,176 [1]
Collateral 0 [1] 0 [1]
Net Amount 8 [1] 2,176 [1]
Other Liabilities | Foreign Currency Forward Contracts, Investment Operations
    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 708 [2] 1,557 [2]
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 283 [2] 338 [2]
Net Amounts of Liabilities Presented in the Balance Sheet 425 [2] 1,219 [2]
Collateral 0 [2] 0 [2]
Net Amount 425 [2] 1,219 [2]
Other Liabilities | Credit Default Swaps
    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 64 94
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 45 82
Net Amounts of Liabilities Presented in the Balance Sheet 19 12
Collateral 0 0
Net Amount 19 12
Other Liabilities | Weather Contract
    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 1,307 2,490
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0 0
Net Amounts of Liabilities Presented in the Balance Sheet 1,307 2,490
Collateral 0 0
Net Amount $ 1,307 $ 2,490
[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.