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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
0 Months Ended 12 Months Ended
Jan. 20, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives   $ 13,330 $ (55,884) $ 56,022
Net investment income (loss) [Member] | Interest Rate Futures [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives   (1,746) (25,256) (9,124)
Net investment income (loss) [Member] | Credit Default Swap [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives   1,074 (1,467) 1,265
Net foreign exchange gains (losses) [Member] | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives   13,804 [1] (5,443) [1] 4,242 [1]
Net foreign exchange gains (losses) [Member] | Foreign Currency Forward Contracts, Investment Operations [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives   (3,445) [2] (4,335) [2] 20,111 [2]
Net foreign exchange gains (losses) [Member] | Foreign Currency Forward Contracts, Energy And Risk Operations [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives   (415) [3] 620 [3] 498 [3]
Other income (loss) [Member] | Energy And Weather Contracts [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives   4,058 (22,978) 28,976
Other income (loss) [Member] | Platinum Warrant [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives $ 3,000 $ 0 $ 2,975 $ 10,054
[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.
[3] Contracts used to manage foreign currency risks in energy and risk operations.