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Derivative Instruments (Narrative) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Other Assets      
Derivative [Line Items]      
Derivative Asset $ 1,911 $ 7,694  
Interest Rate Contracts | Other Assets      
Derivative [Line Items]      
Derivative Asset 106 0  
Interest Rate Contracts | Long      
Derivative [Line Items]      
Derivative, Notional Amount 1,355,900 587,000  
Interest Rate Contracts | Short      
Derivative [Line Items]      
Derivative, Notional Amount 1,414,000 617,400  
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Other Assets      
Derivative [Line Items]      
Derivative Asset 1,020 4,003  
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Long      
Derivative [Line Items]      
Derivative, Notional Amount 162,400 144,800  
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Short      
Derivative [Line Items]      
Derivative, Notional Amount 126,200 121,600  
Foreign Currency Forward Contracts, Investment Operations | Other Assets      
Derivative [Line Items]      
Derivative Asset 646 3,311  
Foreign Currency Forward Contracts, Investment Operations | Long      
Derivative [Line Items]      
Derivative, Notional Amount 32,200 35,800  
Foreign Currency Forward Contracts, Investment Operations | Short      
Derivative [Line Items]      
Derivative, Notional Amount 127,300 150,100  
Credit Default Swaps | Other Assets      
Derivative [Line Items]      
Derivative Asset 139 380  
Credit Default Swaps | Long      
Derivative [Line Items]      
Derivative, Notional Amount 0 4,600  
Credit Default Swaps | Short      
Derivative [Line Items]      
Derivative, Notional Amount 32,700 19,400  
Weather contract | Short      
Derivative [Line Items]      
Derivative, Notional Amount $ 2,100 $ 2,200  
Call Rights | Other Assets      
Derivative [Line Items]      
Derivative Asset     $ 2,220