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Earnings Per Share
 6 Months Ended
Jun. 30, 2021
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)
2021202020212020
Net income attributable to the Company$31,397 $32,354 $58,980 $41,463 
Weighted average number of shares:
Weighted average number of shares used in calculating basic net income per share
32,375 32,328 32,363 32,320 
Effect of dilutive stock-based compensation plans47 8 48 8 
Weighted average number of shares used in calculating diluted net income per share32,422 32,336 32,411 32,328 
Average market price of common stock used for calculation of dilutive shares$87.53 $54.08 $83.48 $59.73 
Net income attributable to the Company per share:
Basic$0.97 $1.00 $1.82 $1.28 
Diluted$0.97 $1.00 $1.82 $1.28