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Derivative Instruments (Narrative) (Details) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Derivative [Line Items]    
Derivative Asset $ 8,741,000 $ 10,667,000
Interest Rate Contracts | Long
    
Derivative [Line Items]    
Derivative, Notional Amount 493,900,000 1,169,300,000
Interest Rate Contracts | Short
    
Derivative [Line Items]    
Derivative, Notional Amount 566,600,000 356,600,000
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Long
    
Derivative [Line Items]    
Derivative, Notional Amount 154,800,000 263,600,000
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Short
    
Derivative [Line Items]    
Derivative, Notional Amount 193,100,000 139,800,000
Foreign Currency Forward Contracts, Investment Operations | Long
    
Derivative [Line Items]    
Derivative, Notional Amount 29,900,000 39,600,000
Foreign Currency Forward Contracts, Investment Operations | Short
    
Derivative [Line Items]    
Derivative, Notional Amount 150,000,000 159,100,000
Credit Default Swaps | Long
    
Derivative [Line Items]    
Derivative, Notional Amount 5,000,000 7,100,000
Credit Default Swaps | Short
    
Derivative [Line Items]    
Derivative, Notional Amount 27,400,000 18,400,000
Weather Contract | Short
    
Derivative [Line Items]    
Derivative, Notional Amount 2,300,000 6,400,000
Other Assets [Member] | Interest Rate Contracts
    
Derivative [Line Items]    
Derivative Asset 482,000 835,000
Other Assets [Member] | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations
    
Derivative [Line Items]    
Derivative Asset 5,930,000 [1] 8,433,000 [1]
Other Assets [Member] | Foreign Currency Forward Contracts, Investment Operations
    
Derivative [Line Items]    
Derivative Asset 1,462,000 [2] 675,000 [2]
Other Assets [Member] | Credit Default Swaps
    
Derivative [Line Items]    
Derivative Asset 603,000 724,000
Other Assets [Member] | Call Rights
    
Derivative [Line Items]    
Derivative Asset $ 264,000  
[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.