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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Other Assets      
Derivative [Line Items]      
Derivative Asset $ 3,589 $ 7,694  
Interest Rate Contracts | Other Assets      
Derivative [Line Items]      
Derivative Asset 614 0  
Interest Rate Contracts | Long      
Derivative [Line Items]      
Derivative, Notional Amount 1,048,700 587,000  
Interest Rate Contracts | Short      
Derivative [Line Items]      
Derivative, Notional Amount 1,429,500 617,400  
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Other Assets      
Derivative [Line Items]      
Derivative Asset 1,610 4,003  
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Long      
Derivative [Line Items]      
Derivative, Notional Amount 271,200 144,800  
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Short      
Derivative [Line Items]      
Derivative, Notional Amount 257,100 121,600  
Foreign Currency Forward Contracts, Investment Operations | Other Assets      
Derivative [Line Items]      
Derivative Asset 863 3,311  
Foreign Currency Forward Contracts, Investment Operations | Long      
Derivative [Line Items]      
Derivative, Notional Amount 34,100 35,800  
Foreign Currency Forward Contracts, Investment Operations | Short      
Derivative [Line Items]      
Derivative, Notional Amount 152,300 150,100  
Credit Default Swaps | Other Assets      
Derivative [Line Items]      
Derivative Asset 502 380  
Credit Default Swaps | Long      
Derivative [Line Items]      
Derivative, Notional Amount 2,200 4,600  
Credit Default Swaps | Short      
Derivative [Line Items]      
Derivative, Notional Amount 39,900 19,400  
Weather Contract | Short      
Derivative [Line Items]      
Derivative, Notional Amount $ 1,900 $ 2,200  
Call Rights | Other Assets      
Derivative [Line Items]      
Derivative Asset     $ 264