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Investment Income (Tables)
12 Months Ended
Dec. 31, 2012
Investment Income [Abstract]  
Investment income
The components of investment income for the years ended December 31, 2012, 2011 and 2010 are as follows:
 
($ in thousands)
 
2012
  
2011
  
2010
 
           
Interest and dividend income
 $3,753  $2,184  $3,471 
Investment gain
  9,780   1,071   3,010 
Equity earnings (loss)
  (522)  (864)  367 
Total investment income
 $13,011  $2,391  $6,848