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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2011
Fair Value of Financial Instruments  
Schedule of Fair Value of Financial Instruments
                                         
                    Fair value measurement using:  
                    Quoted prices in             Significant  
                    active markets for     Significant other     unobservable  
    Carrying             identical assets     observable inputs     inputs  
    amount     Total fair value     (Level 1)     (Level 2)     (Level 3)  
Available for sale securities:
                                       
U.S. Government and Government agencies
  $ 39,016     $ 39,016     $ 39,016     $     $  
States, municipalities and political subdivisions
    48,666       48,666             48,666        
Corporate debt
    257,869       257,869             257,869        
 
                                   
Total available for sale fixed maturity investments
    345,551       345,551                          
 
                                   
Trading securities:
                                       
U.S. Government and Government agencies
  $ 982,274     $ 982,274     $ 835,748     $ 146,526     $  
Non-U.S. Government and Government agencies
    177,529       177,529             177,529        
States, municipalities and political subdivisions
    108,256       108,256             108,256        
Corporate debt
    2,348,875       2,348,875             2,348,875        
Mortgage-backed
    1,904,564       1,904,564             1,687,904       216,660  
Asset-backed
    679,536       679,536             566,226       113,310  
 
                                   
Total trading fixed maturity investments
    6,201,034       6,201,034                          
 
                                   
Total fixed maturity investments
    6,546,585       6,546,585                          
 
                                   
Hedge funds
    562,267       562,267                   562,267  
Equity securities
    393,913       393,913       393,913              
 
                             
Total investments
  $ 7,502,765     $ 7,502,765     $ 1,268,677     $ 5,341,851     $ 892,237  
 
                             
Senior notes
  $ 797,823     $ 878,085     $     $ 878,085     $  
Schedule of Fair Value Measurement Using Significant Unobservable Inputs Level Three
                         
    Fair value measurement using significant  
    unobservable inputs (Level 3):  
    Hedge funds     Mortgage-backed     Asset-backed  
Three Months Ended June 30, 2011
                       
Opening balance
  $ 469,999     $ 234,087     $ 143,829  
Total realized and unrealized gains included in net income
    5,435       4,251       596  
Total realized and unrealized losses included in net income
    (4,621 )     (2,571 )     (102 )
Purchases
    94,290       29,827       32,408  
Sales
    (2,836 )     (34,329 )     (2,800 )
Transfers into Level 3
          24,389       20,246  
Transfers out of Level 3
          (38,994 )     (80,867 )
 
                 
Ending balance
  $ 562,267     $ 216,660     $ 113,310  
 
                 
 
                       
Three Months Ended June 30, 2010
                       
Opening balance
  $ 242,135     $ 233,667     $ 36,532  
Total realized and unrealized gains included in net income
    1,742       9,703       79  
Total realized and unrealized losses included in net income
    (2,906 )     (6,987 )     (279 )
Change in unrealized gains included in Other
                       
Comprehensive Income ("OCI")
          1,639       9  
Change in unrealized losses included in OCI
          (205 )      
Purchases
    78,621       96,089       28,868  
Sales
          (47,560 )     (2,058 )
Transfers into Level 3
          2,286       50,641  
Transfers out of Level 3
          (9,843 )     (10,237 )
 
                 
Ending balance
  $ 319,592     $ 278,789     $ 103,555  
 
                 
 
                       
Six Months Ended June 30, 2011
                       
Opening balance
  $ 347,632     $ 172,558     $ 48,707  
Total realized and unrealized gains included in net income
    21,884       5,495       660  
Total realized and unrealized losses included in net income
    (9,391 )     (2,268 )     (73 )
Purchases
    245,340       62,604       115,417  
Sales
    (43,198 )     (43,287 )     (3,226 )
Transfers into Level 3
          86,085       32,801  
Transfers out of Level 3
          (64,527 )     (80,976 )
 
                 
Ending balance
  $ 562,267     $ 216,660     $ 113,310  
 
                 
 
                       
Six Months Ended June 30, 2010
                       
Opening balance
  $ 184,725     $ 253,979     $ 104,871  
Total realized and unrealized gains included in net income
    6,584       18,084       634  
Total realized and unrealized losses included in net income
    (3,386 )     (7,098 )     (209 )
Change in unrealized gains included in OCI
          5,084       51  
Change in unrealized losses included in OCI
          (447 )     (6 )
Purchases
    131,669       120,943       51,181  
Sales
          (119,228 )     (5,246 )
Transfers into Level 3
          48,731       50,739  
Transfers out of Level 3
          (41,259 )     (98,460 )
 
                 
Ending balance
  $ 319,592     $ 278,789     $ 103,555