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Derivative Instruments (Gain (Loss) Recognized In The Consolidated Statements Of Operations Related To Its Derivative Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives $ 3,663 $ 10,210 $ (11,132) $ 21,611
Net foreign exchange gains | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives (1,340) [1] 11,388 [1] 769 [1] 512 [1]
Net foreign exchange gains | Foreign Currency Forward Contracts, Investment Operations
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 8,827 [2] (5,016) [2] 7,486 [2] (3,670) [2]
Net realized and unrealized (losses) gains on investments | Interest Rate Contracts
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives (1,805) 3,291 (21,441) 23,496
Net realized and unrealized (losses) gains on investments | Credit Default Swaps
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives (72) 266 386 992
Net realized and unrealized (losses) gains on investments | Weather Contract
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 9 0 1,404 0
Other income (loss) | Call Rights
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives (1,956) 0 264 0
Other income (loss) | Other
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives $ 0 $ 281 $ 0 $ 281
[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.