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Capital Structure - Summary of Authorized and Issued Share Capital (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2018
Dec. 31, 2017
Sep. 20, 2016
Class of Stock [Line Items]          
Ordinary shares, par value (in usd per share)     $ 0.0015144558 $ 0.0015144558  
Authorized share capital:          
Number of ordinary shares (in shares)     969,629,030 969,629,030  
Number of non-voting shares (in shares)     6,787,880 6,787,880  
Number of preference shares (in shares)     100,000,000 100,000,000  
Ordinary Shares 0.15144558¢ per share     $ 1,469 $ 1,469  
Non-Voting Shares 0.15144558¢ per share     10 10  
Preference Shares 0.15144558¢ per share     152 152  
Total authorized share capital     $ 1,631 $ 1,631  
Issued share capital:          
Ordinary shares, issued (in shares)     59,697,669 59,474,085  
Issued ordinary shares of 0.15144558¢ per share     $ 90 $ 90  
Total issued share capital     $ 122 $ 122  
Non Voting Shares Par Or Stated Value Per Share     $ 0.0015144558 $ 0.0015144558  
Preference shares, par value (in usd per share)     0.0015144558 0.0015144558  
Preferred shares, liquidation preference (in USD per share)     $ 25 $ 25  
Ordinary shares acquired and canceled, shares 451,268 648,941      
Ordinary shares purchased and canceled, value $ 20,000 $ 30,000      
5.95% preference shares          
Issued share capital:          
Preference shares, issued (in shares)     11,000,000 11,000,000  
Issued preference shares of 0.15144558¢ each with a liquidation preference     $ 17 $ 17  
Preference shares, par value (in usd per share)     $ 0.0015144558 $ 0.0015144558  
Preferred shares, liquidation preference (in USD per share)     $ 25 $ 25  
Preferred Stock Dividends Rate Percentage     5.95% 5.95%  
5.625% preference shares          
Issued share capital:          
Preference shares, issued (in shares)     10,000,000 10,000,000 10,000,000
Issued preference shares of 0.15144558¢ each with a liquidation preference     $ 15 $ 15  
Preference shares, par value (in usd per share)     $ 0.0015144558 $ 0.0015144558  
Preferred shares, liquidation preference (in USD per share)     $ 25 $ 25  
Preferred Stock Dividends Rate Percentage     5.625% 5.625%