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Derivative Instruments (Consolidated Balance Sheets And Fair Value Of The Principal Derivative Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Derivative Assets    
Gross Amounts of Recognized Assets $ 14,153 $ 12,328
Gross Amounts Offset in the Balance Sheet 4,207 1,661
Net Amounts of Assets Presented in the Balance Sheet 9,946 10,667
Collateral 570 310
Net Amount 9,376 10,357
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 3,915 6,419
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 460 510
Net Amounts of Liabilities Presented in the Balance Sheet 3,455 5,909
Collateral 331 12
Net Amount 3,124 5,897
Call Rights
    
Derivative Assets    
Net Amounts of Assets Presented in the Balance Sheet 2,200  
Other Assets | Interest Rate Contracts
    
Derivative Assets    
Gross Amounts of Recognized Assets 190 897
Gross Amounts Offset in the Balance Sheet 189 62
Net Amounts of Assets Presented in the Balance Sheet 1 835
Collateral 0 0
Net Amount 1 835
Other Assets | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations
    
Derivative Assets    
Gross Amounts of Recognized Assets 10,764 [1] 9,612 [1]
Gross Amounts Offset in the Balance Sheet 3,747 [1] 1,179 [1]
Net Amounts of Assets Presented in the Balance Sheet 7,017 [1] 8,433 [1]
Collateral 0 [1] 0 [1]
Net Amount 7,017 [1] 8,433 [1]
Other Assets | Foreign Currency Forward Contracts, Investment Operations
    
Derivative Assets    
Gross Amounts of Recognized Assets 249 [2] 1,013 [2]
Gross Amounts Offset in the Balance Sheet 238 [2] 338 [2]
Net Amounts of Assets Presented in the Balance Sheet 11 [2] 675 [2]
Collateral 0 [2] 0 [2]
Net Amount 11 [2] 675 [2]
Other Assets | Credit Default Swaps
    
Derivative Assets    
Gross Amounts of Recognized Assets 730 806
Gross Amounts Offset in the Balance Sheet 33 82
Net Amounts of Assets Presented in the Balance Sheet 697 724
Collateral 570 310
Net Amount 127 414
Other Assets | Call Rights
    
Derivative Assets    
Gross Amounts of Recognized Assets 2,220  
Gross Amounts Offset in the Balance Sheet 0  
Net Amounts of Assets Presented in the Balance Sheet 2,220  
Collateral 0  
Net Amount 2,220  
Other Liabilities | Interest Rate Contracts
    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 530 74
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 189 62
Net Amounts of Liabilities Presented in the Balance Sheet 341 12
Collateral 331 12
Net Amount 10 0
Other Liabilities | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations
    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 1,042 [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 1,042 [1] 2,176 [1]
Collateral 0 [1] 0 [1]
Net Amount 1,042 [1] 2,176 [1]
Other Liabilities | Foreign Currency Forward Contracts, Investment Operations
    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 1,151 [2] 1,557 [2]
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 238 [2] 338 [2]
Net Amounts of Liabilities Presented in the Balance Sheet 913 [2] 1,219 [2]
Collateral 0 [2] 0 [2]
Net Amount 913 [2] 1,219 [2]
Other Liabilities | Credit Default Swaps
    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 43 94
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 33 82
Net Amounts of Liabilities Presented in the Balance Sheet 10 12
Collateral 0 0
Net Amount 10 12
Other Liabilities | Weather Contract
    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 1,149 2,490
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0 0
Net Amounts of Liabilities Presented in the Balance Sheet 1,149 2,490
Collateral 0 0
Net Amount $ 1,149 $ 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.