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Capital Structure - Summary of Authorized and Issued Share Capital (Details) - USD ($)
$ / shares in Units, $ in Thousands
Mar. 31, 2017
Dec. 31, 2016
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:      
Number of issued ordinary shares (in shares) 59,988,434 59,774,464  
Issued ordinary shares of 0.15144558¢ per share $ 91 $ 91  
Total issued share capital $ 133 $ 140  
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  
7.401% preference shares      
Issued share capital:      
Preference shares, issued (in shares) 0 5,327,500  
Issued preference shares of 0.15144558¢ each with a liquidation preference $ 0 $ 8  
Preference shares, par value (in usd per share) $ 0 $ 0.0015144558  
Preferred shares, liquidation preference (in USD per share) $ 0 $ 25  
Preferred Stock Dividends Rate Percentage 0.00% 7.401%  
7.250% preference shares      
Issued share capital:      
Preference shares, issued (in shares) 6,400,000 6,400,000  
Issued preference shares of 0.15144558¢ each with a liquidation preference $ 10 $ 10  
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 7.25% 7.25%  
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 $ 25
Preferred Stock Dividends Rate Percentage 5.625% 5.625%