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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2011
Fair Value Measurements [Abstract]  
Assets at fair value
   Level 1   Level 2   Level 3   Total  
December 31, 2011            
              
Fixed income securities - available for sale            
 U.S. government and government agency securities$201,582 $94,097 $0 $295,679 
 Fixed income securities of states, municipalities and             
  political subdivisions 0  1,085,341  0  1,085,341 
 Special purpose revenue bonds of states, municipalities             
  and political subdivisions 0  1,863,888  0  1,863,888 
 Corporate fixed income securities 0  846,178  155  846,333 
 Residential mortgage-backed securities 0  1,100,086  0  1,100,086 
 Commercial mortgage-backed securities 0  256,124  0  256,124 
 Asset-backed securities 0  33,731  1,015  34,746 
 Foreign government securities 0  236,637  0  236,637 
  Total fixed income securities - available for sale 201,582  5,516,082  1,170  5,718,834 
Other investments 35,720  0  0  35,720 
Other assets 0  0  1,516  1,516 
 Total assets measured at fair value $237,302 $ 5,516,082 $ 2,686 $5,756,070 

December 31, 2010            
              
Fixed income securities - available for sale            
 U.S. government and government agency securities$148,217 $176,050 $0 $324,267 
 Fixed income securities of states, municipalities and             
  political subdivisions 0  1,082,057  0  1,082,057 
 Special purpose revenue bonds of states, municipalities             
  and political subdivisions 0  1,628,059  0  1,628,059 
 Corporate fixed income securities 0  570,152  242  570,394 
 Residential mortgage-backed securities 0  995,108  0  995,108 
 Commercial mortgage-backed securities 0  145,228  0  145,228 
 Asset-backed securities 0  11,370  1,196  12,566 
 Foreign government securities 0  241,761  0  241,761 
  Total fixed income securities - available for sale 148,217  4,849,785  1,438  4,999,440 
Other investments 5,575  0  0  5,575 
Other assets 0  0  857  857 
 Total assets measured at fair value $153,792 $4,849,785 $2,295 $5,005,872 
Changes in fair value of level 3 assets
 2011  2010 
 Fixed         Fixed        
 income  Other      income  Other     
 securities assets Total   securities assets Total  
Balance at beginning of year$1,438 $857 $2,295  $4,262 $432 $4,694 
Settlements 0  0  0   0  (8,342)  (8,342) 
Net gains (losses) – realized  (2)  0  (2)   0  8,342  8,342 
Net gains – unrealized  17  659  676   203  425  628 
Sales (283)  0  (283)   (484)  0  (484) 
Transfers out of Level 3  0  0  0   (2,543)  0  (2,543) 
Balance at December 31$1,170 $1,516 $2,686  $1,438 $857 $2,295