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Earnings Per Share
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Earnings Per Share

8. Earnings Per Share

The amounts used in computing earnings per share and the weighted average number of shares of potentially dilutive securities are as follows:

    Three months ended June 30,  

Six months ended June 30,
(in thousands, except market price and earnings per share)   2015   2014   2015   2014
                       
Net income/(loss) attributable to the Company   $
 (2,172 )   $
 11,219
     $ 10,041     $ 21,840  
                           
Weighted average number of shares:                              
   Weighted average number of shares used in                              
   calculating basic net income per share     31,999       31,832       31,941       31,809  
Effect of dilutive stock-based compensation plans:                              
   Stock options     -       103       74       104  

                             
Weighted average number of shares used in calculating diluted net income per share     31,999
       31,935       32,015       31,913  

                             
Shares related to stock-based compensation plans that were not included in the computation of diluted earnings per share because to do so would be antidilutive      56       -       -       -  
                                 
Average market price of common stock used for calculation of dilutive shares   $
 40.12
     $
 36.23     $ 38.76     $ 35.97  
                                 
Earnings per share attributable to Company shareholders:                                
 Basic   $
 (0.07 )   $
 0.35     $ 0.31     $ 0.69  
 Diluted   $
 (0.07 )   $
 0.35     $ 0.31     $ 0.68