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Earnings Per Share
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Earnings Per Share 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)2020201920202019
Net income attributable to the Company$32,354  $34,054  $41,463  $63,244  
Weighted average number of shares:
Weighted average number of shares used in calculating basic net income per share32,328  32,299  32,320  32,286  
Effect of dilutive stock-based compensation plans:
Stock options8  12  8  12  
Weighted average number of shares used in calculating diluted net income per share32,336  32,311  32,328  32,298  
Average market price of common stock used for calculation of dilutive shares$54.08  $74.86  $59.73  $73.08  
Net income attributable to the Company per share:
Basic$1.00  $1.05  $1.28  $1.96  
Diluted$1.00  $1.05  $1.28  $1.96