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Earnings per share (Tables)
 12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Schedule of Computation of the Income (Loss) and Share Data Used in the Basic and Diluted Earnings Per Share
The computation of the (losses) income and share data used in the basic and diluted (loss) earnings per share is as follows:
 
 
  
2020
 
 
2019
 
  
2018
 
Basic earnings per share -
  
   
 
   
  
   
Net (loss) income
  
$
(607,062
) 
 
$
247,002
 
  
$
88,198
 
Weighted-average shares outstanding
  
 
42,338
 
 
 
42,258
 
  
 
42,182
 
Non-vested
dividend participating awards
  
 
170
 
 
 
225
 
  
 
274
 
 
  
 
 
 
 
 
 
 
  
 
 
 
 
  
 
42,508
 
 
 
42,483
 
  
 
42,456
 
 
  
 
 
 
 
 
 
 
  
 
 
 
 
  
 
(14.28
) 
 
 
5.81
 
  
 
2.08