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Fair value measurements (Tables)
9 Months Ended
Sep. 30, 2011
Fair value measurements [Abstract] 
Fair value measurements for items measured at fair value
Fair value measurements for assets measured at fair value included the following as of September 30, 2011 and December 31, 2010:
 
   
Fair Value
  
Quoted Prices in Active Markets for Identical Assets (Level 1)
  
Significant Other Observable Inputs
 (Level 2)
  
Significant Unobservable Inputs
 (Level 3)
 
   
(In thousands)
 
September 30, 2011
            
              
U.S. Treasury securities and obligations of U.S. government corporations and agencies
 $776,254  $776,254  $-  $- 
Obligations of U.S. states and political subdivisions
  2,999,632   -   2,778,425   221,207 
Corporate debt securities
  2,293,106   2,476   2,220,340   70,290 
Commercial mortgage-backed securities
  195,033   -   195,033   - 
Residential mortgage-backed securities
  49,835   -   49,835   - 
Debt securities issued by foreign sovereign governments
  141,661   132,382   9,279   - 
Total debt securities
  6,455,521   911,112   5,252,912   291,497 
Equity securities
  2,699   2,378   -   321 
Total investments
 $6,458,220  $913,490  $5,252,912  $291,818 
                  
Real estate acquired (1)
 $2,324  $-  $-  $2,324 
                  
December 31, 2010
                
                  
U.S. Treasury securities and obligations of U.S. government corporations and agencies
 $1,102,786  $1,102,786  $-  $- 
Obligations of U.S. states and political subdivisions
  3,580,066   -   3,284,376   295,690 
Corporate debt securities
  2,564,959   2,563   2,492,343   70,053 
Residential mortgage-backed securities
  57,100   -   57,100   - 
Debt securities issued by foreign sovereign governments
  150,327   135,457   14,870   - 
Total debt securities
  7,455,238   1,240,806   5,848,689   365,743 
Equity securities
  3,044   2,723   -   321 
Total investments
 $7,458,282  $1,243,529  $5,848,689  $366,064 
                  
Real estate acquired (1)
 $6,220  $-  $-  $6,220 
 
(1) Real estate acquired through claim settlement, which is held for sale, is reported in Other Assets on the consolidated balance sheet.
Reconciliation of beginning and ending balance for assets measured at fair value with significant unobservable inputs (level 3)
For assets measured at fair value using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances for the three and nine months ended September 30, 2011 and 2010 is as follows:

   
Obligations of U.S. States and Political Subdivisions
  
Corporate Debt Securities
  
Equity
Securities
  
Total
Investments
  
Real Estate
Acquired
 
   
(In thousands)
 
Balance at June 30, 2011
 $223,402  $70,039  $321  $293,762  $2,828 
Total realized/unrealized gains (losses):
                    
Included in earnings and reported as net impairment losses recognized in earnings
  -   (200)  -   (200)  - 
                     
Included in earnings and reported as losses incurred, net
  -   -   -   -   (85)
                     
Included in other comprehensive income
  342   451   -   793   - 
                     
Purchases
  -   -   -   -   1,148 
Sales
  (2,537)  -   -   (2,537)  (1,567)
Transfers into Level 3
  -   -   -   -   - 
Transfers out of Level 3
  -   -   -   -   - 
Balance at September 30, 2011
 $221,207  $70,290  $321  $291,818  $2,324 
                      
Amount of total losses included in earnings for the three months ended September 30, 2011 attributable to the change in unrealized losses on assets still held at September 30, 2011
 $-  $-  $-  $-  $- 

   
Obligations of U.S. States and Political Subdivisions
  
Corporate Debt Securities
  
Equity
 Securities
  
Total
Investments
  
Real Estate
 Acquired
 
   
(In thousands)
 
Balance at December 31, 2010
 $295,690  $70,053  $321  $366,064  $6,220 
Total realized/unrealized gains (losses):
                    
Included in earnings and reported as net impairment losses recognized in earnings
  -   (200)  -   (200)  - 
                     
Included in earnings and reported as losses incurred, net
  -   -   -   -   (180)
                     
Included in other comprehensive income
  (845)  437   -   (408)  - 
                     
Purchases
  -   -   -   -   3,944 
Sales
  (73,638)  -   -   (73,638)  (7,660)
Transfers into Level 3
  -   -   -   -   - 
Transfers out of Level 3
  -   -   -   -   - 
Balance at September 30, 2011
 $221,207  $70,290  $321  $291,818  $2,324 
                      
Amount of total losses included in earnings for the nine months ended September 30, 2011 attributable to the change in unrealized losses on assets still held at September 30, 2011
 $-  $-  $-  $-  $- 
 
   
Obligations of U.S. States and Political Subdivisions
  
Corporate Debt Securities
  
Equity
 Securities
  
Total
 Investments
  
Real Estate
Acquired
 
   
(In thousands)
 
Balance at June 30, 2010
 $321,050  $94,564  $321  $415,935  $5,671 
Total realized/unrealized gains (losses):
                    
Included in earnings and reported as realized investment losses, net
  -   (1,057)  -   (1,057)  - 
                     
Included in earnings and reported as losses incurred, net
  -   -   -   -   (701)
                     
Included in other comprehensive income
  3,504   2,528   -   6,032   - 
                     
Purchases, issuances and settlements
  (12,858)  (15,793)  -   (28,651)  1,893 
Transfers in and/or out of Level 3
  -   -   -   -   - 
Balance at September 30, 2010
 $311,696  $80,242  $321  $392,259  $6,863 
                      
Amount of total losses included in earnings for the three months ended September 30, 2010 attributable to the change in unrealized losses on assets still held at September 30, 2010
 $-  $-  $-  $-  $- 

   
Obligations of U.S. States and Political Subdivisions
  
Corporate Debt Securities
  
Equity
Securities
  
Total
 Investments
  
Real Estate
Acquired
 
   
(In thousands)
 
Balance at December 31, 2009
 $370,341  $129,338  $321  $500,000  $3,830 
Total realized/unrealized gains (losses):
                    
Included in earnings and reported as realized investment losses, net
  -   (2,455)  -   (2,455)  - 
                     
Included in earnings and reported as losses incurred, net
  -   -   -   -   (1,635)
                     
Included in other comprehensive income
  3,547   2,854   -   6,401   - 
                     
Purchases, issuances and settlements
  (62,192)  (49,495)  -   (111,687)  4,668 
Transfers in and/or out of Level 3
  -   -   -   -   - 
Balance at September 30, 2010
 $311,696  $80,242  $321  $392,259  $6,863 
                      
Amount of total losses included in earnings for the nine months ended September 30, 2010 attributable to the change in unrealized losses on assets still held at September 30, 2010
 $-  $-  $-  $-  $-