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Investment income (Tables)
 12 Months Ended
Dec. 31, 2015
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:
 
 
2015
 
2014
 
2013
 
($000 omitted)
Investment income:
 
 
 
 
 
Debt securities
15,181

 
14,593

 
13,387

Short-term investments, cash equivalents and other
1,669

 
2,213

 
2,105

 
16,850

 
16,806

 
15,492

Investment and other (losses) gains – net:
 
 
 
 
 
Realized gains
5,948

 
12,018

 
7,555

Realized losses
(7,317
)
 
(5,274
)
 
(8,621
)
 
(1,369
)
 
6,744

 
(1,066
)