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Derivative Instruments (Narrative) (Details) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Derivative [Line Items]    
Derivative Asset $ 9,946,000 $ 10,667,000
Interest Rate Contracts | Long
    
Derivative [Line Items]    
Derivative, Notional Amount 523,500,000 1,169,300,000
Interest Rate Contracts | Short
    
Derivative [Line Items]    
Derivative, Notional Amount 667,400,000 356,600,000
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Long
    
Derivative [Line Items]    
Derivative, Notional Amount 163,600,000 263,600,000
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Short
    
Derivative [Line Items]    
Derivative, Notional Amount 235,500,000 139,800,000
Foreign Currency Forward Contracts, Investment Operations | Long
    
Derivative [Line Items]    
Derivative, Notional Amount 41,600,000 39,600,000
Foreign Currency Forward Contracts, Investment Operations | Short
    
Derivative [Line Items]    
Derivative, Notional Amount 153,100,000 159,100,000
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 25,100,000 18,400,000
Weather Contract | Short
    
Derivative [Line Items]    
Derivative, Notional Amount 6,700,000 6,400,000
Call Rights
    
Derivative [Line Items]    
Derivative Asset $ 2,200,000