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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2012
Fair Value Measurements [Abstract]  
Assets at fair value
   Level 1   Level 2   Level 3   Total  
December 31, 2012            
              
Fixed maturity securities - available for sale            
 U.S. government and government agency securities$174,520 $25,087 $0 $199,607 
 Fixed maturity securities of states, municipalities and             
  political subdivisions 0  1,065,811  0  1,065,811 
 Special purpose revenue bonds of states, municipalities             
  and political subdivisions 0  2,200,331  0  2,200,331 
 Corporate securities 0  1,315,006  164  1,315,170 
 Residential mortgage-backed securities 0  664,887  0  664,887 
 Commercial mortgage-backed securities 0  524,289  0  524,289 
 Asset-backed securities 0  33,275  0  33,275 
 Foreign government securities 0  278,411  0  278,411 
  Total fixed maturity securities - available for sale 174,520  6,107,097  164  6,281,781 
Equity securities - available for sale 284,639  0  0  284,639 
Short-term investments* 251,988  111,065  0  363,053 
Other investments 20,925  0  0  20,925 
Restricted cash and securities 0  2,043  0  2,043 
Premium, claims and other receivables 0  68,207  0  68,207 
Other assets 0  0  349  349 
 Total assets measured at fair value $732,072 $ 6,288,412 $ 513 $7,020,997 
Notes payable*$0 $ 636,363 $0 $636,363 
Accounts payable and accrued liabilities - forward contract 0   3,194  0  3,194 
Accounts payable and accrued liabilities - earnout liability 0  2,043  7,009  9,052 
 Total liabilities measured at fair value $0 $641,600 $7,009 $648,609 

   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*$0 $505,671 $0 $505,671 
Changes in fair value of level 3 assets
 2012 2011 
         Accounts          
        payable         
 Fixed       and Fixed        
 maturity  Other  Total accrued maturity  Other  Total 
 securities assets assets liabilities securities assets assets 
Balance at beginning of year$1,170 $1,516 $$2,686 $0 $1,438 $857 $2,295 
Earnout liability 0  0  0  6,968  0  0  0 
Settlements 0  (1,863)  (1,863)  0  0  0  0 
Sales 0  0  0  0  (283)  0  (283) 
Gains (losses) reported in:                     
Net earnings (1)  696  695  41  (2)  659  657 
Other comprehensive income 10  0  10  0  17  0  17 
Transfers out of Level 3  (1,015)  0  (1,015)  0  0  0  0 
Balance at December 31$164 $349 $513 $7,009 $1,170 $1,516 $2,686