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Derivative Instruments (Gain (Loss) Recognized In The Consolidated Statements Of Operations Related To Its Derivative Instruments) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives $ 6,189 $ (6,596) $ 14,802 $ (14,795)
Net realized and unrealized (losses) gains on investments | Interest Rate Contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 19,784 (7,362) 15,376 (19,636)
Net realized and unrealized (losses) gains on investments | Credit Default Swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 22 299 62 458
Net realized and unrealized (losses) gains on investments | Weather contract        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 10 179 170 1,395
Other income (loss) | Call Rights        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 0 2,220 0 2,220
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 (10,210) (1,990) (6,599) 2,109
Net foreign exchange (losses) gains | Foreign Currency Forward Contracts, Investment Operations        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives $ (3,417) $ 58 $ 5,793 $ (1,341)