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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2012
Fair Value Measurements [Abstract]  
Assets at fair value
   Level 1   Level 2   Level 3   Total  
September 30, 2012            
              
Fixed maturity securities – available for sale            
 U.S. government and government agency securities$193,051 $38,985 $0 $232,036 
 Fixed maturity securities of states, municipalities and             
  political subdivisions 0  1,079,175  0  1,079,175 
 Special purpose revenue bonds of states, municipalities             
  and political subdivisions 0  2,076,017  0  2,076,017 
 Corporate securities 0  1,217,145  162  1,217,307 
 Residential mortgage-backed securities 0  841,542  0  841,542 
 Commercial mortgage-backed securities 0  524,100  0  524,100 
 Asset-backed securities 0  47,724  0  47,724 
 Foreign government securities 0  297,464  0  297,464 
  Total fixed maturity securities – available for sale 193,051  6,122,152  162  6,315,365 
Equity securities – available for sale 202,864  0  0  202,864 
Short-term investments* 81,947  78,191  0  160,138 
Other investments 34,044  0  0  34,044 
Other assets 0  0  206  206 
 Total assets measured at fair value $511,906 $ 6,200,343 $ 368 $6,712,617 
              
Notes payable* $0 $595,804 $0 $595,804 
Accounts payable and accrued liabilities – forward contract 0  1,705  0  1,705 
 Total liabilities measured at fair value $0 $597,509 $0 $597,509 

   Level 1   Level 2   Level 3   Total  
December 31, 2011            
              
Fixed maturity securities – available for sale            
 U.S. government and government agency securities$201,582 $94,097 $0 $295,679 
 Fixed maturity 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 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 maturity securities – available for sale 201,582  5,516,082  1,170  5,718,834 
Fixed maturity securities – held to maturity* 0  163,136  0  163,136 
Short-term investments* 67,288  66,629  0  133,917 
Other investments 35,720  0  0  35,720 
Other assets 0  0  1,516  1,516 
 Total assets measured at fair value $304,590 $5,745,847 $2,686 $6,053,123 
              
Notes payable* $ - $505,671 $ - $505,671 
Changes in fair value of level 3 assets
 2012  2011 
 Fixed         Fixed        
 income  Other      income  Other     
 securities assets Total   securities assets Total  
Balance at beginning of year$1,170 $1,516 $2,686  $1,438 $857 $2,295 
Net gains (losses) 2  215  217   (13)  263  250 
Sales 0  0  0   (144)  0  (144) 
Transfers out of Level 3  (1,015)  0  (1,015)   0  0  0 
Balance at March 31 157  1,731  1,888   1,281  1,120  2,401 
Net gains (losses) 2  116  118   18  122  140 
Sales 0  0  0   (55)  0  (55) 
Balance at June 30 159  1,847  2,006   1,244  1,242  2,486 
Settlements 0  (1,863)  (1,863)   0  0  0 
Net gains (losses)  3  222  225   17  131  148 
Sales 0  0  0   (43)  0  (43) 
Balance at September 30$162 $206 $368  $1,218 $1,373 $2,591