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Funds Held - Directly Managed (Tables)
12 Months Ended
Dec. 31, 2011
Disclosure - Funds Held-Directly Managed [Abstract]  
Fixed maturities, short-term investments and equities
         Gross   Gross     
         Unrealized   Unrealized   Fair 
December 31, 2011 Cost (1)  Gains   Losses   Value 
                   
Fixed maturities                
 U.S. government and government sponsored enterprises  $255,573  $12,966  $  $268,539 
 U.S. states, territories and municipalities  373      (39)   334 
 Non-U.S. sovereign government, supranational                 
  and government related   260,695   14,024   (54)   274,665 
 Corporate   470,546   12,889   (2,950)   480,485 
                   
Total fixed maturities   987,187   39,879   (3,043)   1,024,023 
Short-term investments   18,097         18,097 
Other invested assets   25,628      (10,063)   15,565 
                   
Total  $1,030,912  $39,879  $(13,106)  $1,057,685 
                   
                   
         Gross   Gross     
         Unrealized   Unrealized   Fair 
December 31, 2010 Cost (1)  Gains   Losses   Value 
                   
Fixed maturities                
 U.S. government and government sponsored enterprises  $280,414  $7,969  $(219)  $288,164 
 U.S. states, territories and municipalities  373   8   (13)   368 
 Non-U.S. sovereign government, supranational                 
  and government related   377,591   7,052   (90)   384,553 
 Corporate   787,804   13,501   (2,718)   798,587 
 Mortgage/asset-backed securities   12,269   2,337   (2,488)   12,118 
                   
Total fixed maturities   1,458,451   30,867   (5,528)   1,483,790 
Short-term investments   38,613         38,613 
Other invested assets   25,133   238   (4,741)   20,630 
                   
Total  $1,522,197  $31,105  $(10,269)  $1,543,033 
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Maturity distribution of fixed maturities and short-term investments
   Cost   Fair Value 
         
One year or less  $ 226,988  $ 227,517 
More than one year through five years    553,586    572,896 
More than five years through ten years    199,821    214,636 
More than ten years    24,889    27,071 
         
Total  $ 1,005,284  $ 1,042,120 
Net realized and unrealized investment gains (losses)
   2011   2010   2009 
             
Net realized investment gains (losses) on fixed maturities and short term investments  $5,369  $1,041  $(2,200) 
Net realized investment (losses) gains on other invested assets  (42)   1,635    
Change in net unrealized investment gains on fixed maturities and short-term investments  12,314   27,568   1,920 
Change in net unrealized investment losses on other invested assets   (6,430)   (2,892)   (1,420) 
             
Net realized and unrealized investment gains (losses) on funds held – directly managed  $11,211  $27,352  $(1,700) 
Net investment income
   2011   2010   2009 
             
Fixed maturities  $31,542  $46,200  $10,956 
Short-term investments, cash and cash equivalents   1,906   1,607   287 
Other   5,402   6,078   6,934 
Investment expenses   (931)   (2,110)   (411) 
             
Net investment income on funds held – directly managed  $37,919  $51,775  $17,766