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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
Mar. 31, 2014
Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) recognized on derivatives $ (8,199) $ 4,502
Net foreign exchange (losses) gains | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations
    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) recognized on derivatives 4,099 [1] 2,388 [1]
Net foreign exchange (losses) gains | Foreign Currency Forward Contracts, Investment Operations
    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) recognized on derivatives (1,399) [2] 1,678 [2]
Net realized and unrealized gains on investments | Interest Rate Contracts
    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) recognized on derivatives (12,274) 2
Net realized and unrealized gains on investments | Credit Default Swaps
    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) recognized on derivatives 159 434
Net realized and unrealized gains on investments | Weather Contract
    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) recognized on derivatives $ 1,216 $ 0
[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.