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Capital Structure - Summary of Authorized and Issued Share Capital (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Authorized share capital:      
Number of ordinary shares 969,629,030 969,629,030  
Number of non-voting shares 6,787,880 6,787,880  
Number of preference shares 100,000,000 100,000,000  
Ordinary Shares, authorized $ 1,469 $ 1,469  
Non-Voting Shares, authorized 10 10  
Preference Shares, authorized 152 152  
Total authorized share capital $ 1,631 $ 1,631  
Issued share capital:      
Ordinary shares, issued 59,474,085 59,774,464 60,918,373
Ordinary shares, value $ 90 $ 91  
Total issued share capital $ 122 $ 140  
7.401% Preference Shares      
Issued share capital:      
Preference shares, issued 0 5,327,500  
Preference shares, value $ 0 $ 8  
7.250% Preference Shares      
Issued share capital:      
Preference shares, issued 0 6,400,000  
Preference shares, value $ 0 $ 10  
5.950% Preference Shares      
Issued share capital:      
Preference shares, issued 11,000,000 11,000,000  
Preference shares, value $ 17 $ 17  
5.625% Preference Shares      
Issued share capital:      
Preference shares, issued 10,000,000 10,000,000  
Preference shares, value $ 15 $ 15