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Investment income (Tables)
 12 Months Ended
Dec. 31, 2012
Gross Realized Investment and Other Gains and Losses

Income from investments and gross realized investment and other gains and losses follow:

 

     2012     2011     2010  
     ($000 omitted)  

Investment income:

       

Debt securities

      12,399        13,860        15,014   

Short-term investments, cash equivalents and other

      1,410        1,645        3,383   
  

 

 

    

 

 

    

 

 

  
     13,809        15,505        18,397   
  

 

 

    

 

 

    

 

 

  

Investment and other gains (losses):

       

Realized gains

      9,417        12,151        24,055   

Realized losses

      (1,839 )      (9,849 )      (2,273 ) 
  

 

 

    

 

 

    

 

 

  
     7,578        2,302        21,782