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Earnings per Share (Tables)
9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Earnings per share (in thousands, except per share amounts)

  Three Months ended   Nine Months ended
  September 30,   September 30,
  2018   2017   2018   2017
Weighted average common shares              
 outstanding during the period              
 - shares used for basic              
 earnings per common share   10,062       10,004       10,037       9,967  
                               
Common shares issuable under                              
 share based payment plans                              
 which are potentially dilutive   73       62       73       68  
                               
Common shares used for diluted                              
 earnings per common share   10,135       10,066       10,110       10,035  
                               
Net income attributable to the Company $ 2,224       25,391       123,766       28,547  
                               
Basic earnings per common share:                              
 Basic $ 0.22       2.54       12.33       2.86  
 Diluted $ 0.22       2.52       12.24       2.84