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Disclosures on reserves in Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 29, 2020
May 19, 2020
Dec. 31, 2020
Dec. 31, 2019
Apr. 23, 2020
Dec. 31, 2018
Disclosure of Disclosures on equity [Line Items]            
Dividend payable per share         $ 1.05668  
interim dividend per share   $ 0.17092        
Provisional dividend paid, Per share       $ 0.80254    
Maximum Threshold Percentage Of Issued Capital For Issuance Of Series B shares       50.00%    
Minimum Percentage Required TO Call Ordinary Or Extraordinary Meeting     5.00%      
Number Of Consecutive Limitation Period Of Series B shares     50 years      
Contractual capital commitments     $ 0      
Special dividend per share 0.37994          
Series A preferred shares [Member]            
Disclosure of Disclosures on equity [Line Items]            
Number of shares issued and fully paid     142,819,552 142,819,552   142,819,552
Series B preferred shares [Member]            
Disclosure of Disclosures on equity [Line Items]            
Number of shares issued and fully paid     120,376,972 120,376,972   120,376,972
Bottom of range [member]            
Disclosure of Disclosures on equity [Line Items]            
Cash dividend rate     30.00%