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Earnings per share (Tables)
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Schedule of computations of basic and diluted earnings per share
Basic and diluted EPS for the three and six months ended June 30, 2020 and 2019 were as follows:
Three Months Ended June 30,Six Months Ended June 30,
2020201920202019
Net income for the computation of basic EPS$246,061  $331,460  $522,885  $565,646  
Weighted average ordinary shares outstanding - basic127,425,886  135,917,192  127,862,816  137,029,147  
Basic EPS$1.93  $2.44  $4.09  $4.13  
Three Months Ended June 30,Six Months Ended June 30,
2020201920202019
Net income for the computation of diluted EPS$246,061  $331,460  $522,885  $565,646  
Weighted average ordinary shares outstanding - diluted128,131,663  137,072,268  128,938,138  138,396,628  
Diluted EPS$1.92  $2.42  $4.06  $4.09  
Schedule of computation of ordinary shares outstanding, excluding unvested restricted stock
Ordinary shares outstanding, excluding shares of unvested restricted stock, as of June 30, 2020 and December 31, 2019 were as follows:
June 30, 2020December 31, 2019
Number of ordinary shares
Ordinary shares issued138,847,345  141,847,345  
Treasury shares(9,174,562) (10,263,856) 
Ordinary shares outstanding129,672,783  131,583,489  
Shares of unvested restricted stock(2,087,383) (2,354,318) 
Ordinary shares outstanding, excluding shares of unvested restricted stock127,585,400  129,229,171