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Investment income (Tables)
 12 Months Ended
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]  
Gross Realized Investment and Other Gains and Losses
Income from investments and gross realized investment and other gains and losses follow:
 
 
2014
 
2013
 
2012
 
($000 omitted)
Investment income:
 
 
 
 
 
Debt securities
14,593

 
13,387

 
12,399

Short-term investments, cash equivalents and other
2,213

 
2,105

 
1,410

 
16,806

 
15,492

 
13,809

Investment and other gains (losses):
 
 
 
 
 
Realized gains
12,018

 
7,555

 
9,417

Realized losses
(5,274
)
 
(8,621
)
 
(1,839
)
 
6,744

 
(1,066
)
 
7,578