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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2012
Fair Value Measurements [Abstract]  
Assets at fair value
   Level 1   Level 2   Level 3   Total  
June 30, 2012            
              
Fixed maturity securities – available for sale            
 U.S. government and government agency securities$188,757 $40,214 $0 $228,971 
 Fixed maturity securities of states, municipalities and             
  political subdivisions 0  1,073,868  0  1,073,868 
 Special purpose revenue bonds of states, municipalities             
  and political subdivisions 0  2,007,548  0  2,007,548 
 Corporate securities 0  1,129,498  159  1,129,657 
 Residential mortgage-backed securities 0  902,832  0  902,832 
 Commercial mortgage-backed securities 0  416,700  0  416,700 
 Asset-backed securities 0  46,182  0  46,182 
 Foreign government securities 0  292,108  0  292,108 
  Total fixed maturity securities – available for sale 188,757  5,908,950  159  6,097,866 
Equity securities – available for sale 93,660  0  0  93,660 
Short-term investments* 129,828  87,259  0  217,087 
Other investments 37,720  0  0  37,720 
Other assets 0  0  1,847  1,847 
 Total assets measured at fair value $449,965 $ 5,996,209 $ 2,006 $6,448,180 
              
Notes payable* $0 $635,479 $0 $635,479 
Accounts payable and accrued liabilities – forward contract 0  926  0  926 
 Total liabilities measured at fair value $0 $636,405 $0 $636,405 

   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) – realized  0  0  0   (2)  0  (2) 
Net gains (losses) – unrealized  2  215  217   (11)  263  252 
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) – realized  (1)  0  (1)   0  0  0 
Net gains (losses) – unrealized  3  116  119   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