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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value Measurements [Abstract] 
Assets at fair value
   Level 1   Level 2   Level 3   Total  
September 30, 2011            
              
Fixed income securities - available for sale            
 U.S. government and government agency securities$185,530 $107,814 $0 $293,344 
 Fixed income securities of states, municipalities and             
  political subdivisions 0  1,079,859  0  1,079,859 
 Special purpose revenue bonds of states, municipalities             
  and political subdivisions 0  1,815,959  0  1,815,959 
 Corporate fixed income securities 0  813,450  156  813,606 
 Residential mortgage-backed securities 0  1,111,321  0  1,111,321 
 Commercial mortgage-backed securities 0  249,051  0  249,051 
 Asset-backed securities 0  33,555  1,062  34,617 
 Foreign government securities 0  253,432  0  253,432 
  Total fixed income securities - available for sale 185,530  5,464,441  1,218  5,651,189 
Other investments 34,088  0  0  34,088 
Other assets 0  0  1,373  1,373 
 Total assets measured at fair value $219,618 $ 5,464,441 $ 2,591 $5,686,650 

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) 
Sales (144)  0  (144)   (100)  0  (100) 
Gains and (losses) – unrealized  (11)  263  252   62  (141)  (79) 
Gains and (losses) – realized  (2)  0  (2)   0  8,342  8,342 
Balance at March 31 1,281  1,120  2,401   4,224  291  4,515 
Sales (55)  0  (55)   (395)  0  (395) 
Gains and (losses) – unrealized  18  122  140   144  179  323 
Balance at June 30 1,244  1,242  2,486   3,973  470  4,443 
Sales (43)  0  (43)   (77)  0  (77) 
Gains and (losses) – unrealized  17  131  148   70  216  286 
Transfers out of Level 3  0  0  0   (2,543)  0  (2,543) 
Balance at September 30$1,218 $1,373 $2,591  $1,423 $686 $2,109