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Earnings per Share (Tables)
9 Months Ended
Sep. 30, 2017
Earnings per common share:  
Earnings per share (in thousands, except per share amounts)

  Three Months ended   Nine Months ended
  September 30,   September 30,
  2017   2016   2017   2016
Weighted average common shares              
 outstanding during the period              
 - shares used for basic              
 earnings per common share   10,004       9,865       9,967       9,860  
                               
Common shares issuable under                              
 share based payment plans                              
 which are potentially dilutive   62       43       68       42  
                               
Common shares used for diluted                              
 earnings per common share   10,066       9,908       10,035       9,902  
                               
Net income attributable to the Company $ 25,391       1,957       28,547       4,551  
                               
Basic earnings per common share:                              
 Basic $ 2.54       0.20       2.86       0.46  
 Diluted $ 2.52       0.20       2.84       0.46