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Earnings (loss) per share (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Schedule of Computation of the Income (Loss) and Share Data Used in the Basic and Diluted Earnings Per Share

The computation of the income (loss) and share data used in the basic and diluted earnings per share is as follows:

 

     2017      2016      2015  

Basic earnings (loss) per share -

         

Net income (loss)

    $ 369,658      $ 325,928      $ (240,634 ) 

Weighted-average shares outstanding

      42,111        42,036        43,716  

Non-vested dividend participating awards

      308        322        145  
  

 

 

     

 

 

     

 

 

  
     42,419        42,358        43,861  
  

 

 

     

 

 

     

 

 

  
     8.71        7.69        (5.49 ) 
  

 

 

     

 

 

     

 

 

  
     2017      2016      2015  

Diluted earnings (loss) per share -

         

Net income (loss)

    $ 369,658      $ 325,928      $ (240,634 ) 

Weighted-average shares outstanding used for basic earnings per share

      42,419        42,358        43,861  

Share options on issue

      —          5        8  
  

 

 

     

 

 

     

 

 

  
     42,419        42,363        43,869  
  

 

 

     

 

 

     

 

 

  
     8.71        7.69        (5.49 )