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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives $ (6,596) $ 6,899 $ (14,795) $ 11,401
Net foreign exchange gains (losses) | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives (1,990) [1] (13,264) [1] 2,109 [1] (10,876) [1]
Net foreign exchange gains (losses) | Foreign Currency Forward Contracts, Investment Operations
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 58 [2] (332) [2] (1,341) [2] 1,346 [2]
Net realized and unrealized gains (losses) on investments | Interest Rate Contracts
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives (7,362) 20,203 (19,636) 20,205
Net realized and unrealized gains (losses) on investments | Credit Default Swaps
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 299 292 458 726
Net realized and unrealized gains (losses) on investments | Weather Contract
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 179 0 1,395 0
Other loss | Call Rights
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives $ 2,220 $ 0 $ 2,220 $ 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.