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Capital Structure - Summary of Authorized and Issued Share Capital (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Sep. 20, 2016
Class of Stock [Line Items] |  |  |  |  |  |
Ordinary shares, par value (in usd per share) | $ 0.0015144558 |  | $ 0.0015144558 |  | $ 0.0015144558 |
Authorized share capital: |  |  |  |  |  |
Number of ordinary shares (in shares) | 969,629,030 |  | 969,629,030 |  | 969,629,030 |
Number of non-voting shares (in shares) | 6,787,880 |  | 6,787,880 |  | 6,787,880 |
Number of preference shares (in shares) | 100,000,000 |  | 100,000,000 |  | 100,000,000 |
Ordinary Shares 0.15144558¢ per share | $ 1,469 |  | $ 1,469 |  | $ 1,469 |
Non-Voting Shares 0.15144558¢ per share | 10 |  | 10 |  | 10 |
Preference Shares 0.15144558¢ per share | 152 |  | 152 |  | 152 |
Total authorized share capital | $ 1,631 |  | $ 1,631 |  | $ 1,631 |
Issued share capital: |  |  |  |  |  |
Number of issued ordinary shares (in shares) | 59,844,075 |  | 59,844,075 |  | 59,774,464 |
Issued ordinary shares of 0.15144558¢ per share | $ 91 |  | $ 91 |  | $ 91 |
Total issued share capital | $ 133 |  | $ 133 |  | $ 140 |
Non Voting Shares Par Or Stated Value Per Share | $ 0.0015144558 |  | $ 0.0015144558 |  | $ 0.0015144558 |
Preference shares, par value (in usd per share) | 0.0015144558 |  | 0.0015144558 |  | 0.0015144558 |
Preferred shares, liquidation preference (in USD per share) | $ 25 |  | $ 25 |  | $ 25 |
Shares repurchase and cancelled during period (in shares) | 197,673 | 409,800 | 197,673 | 978,039 |  |
Shares repurchase and cancelled during period, value | $ 10,000 | $ 18,500 | $ 10,000 | $ 43,500 |  |
7.401% preference shares |  |  |  |  |  |
Issued share capital: |  |  |  |  |  |
Preference shares, issued (in shares) | 0 |  | 0 |  | 5,327,500 |
Issued preference shares of 0.15144558¢ each with a liquidation preference | $ 0 |  | $ 0 |  | $ 8 |
Preference shares, par value (in usd per share) | $ 0 |  | $ 0 |  | $ 0.0015144558 |
Preferred shares, liquidation preference (in USD per share) | $ 0 |  | $ 0 |  | $ 25 |
Preferred Stock Dividends Rate Percentage | 0.00% |  | 0.00% |  | 7.401% |
7.250% preference shares |  |  |  |  |  |
Issued share capital: |  |  |  |  |  |
Preference shares, issued (in shares) | 6,400,000 |  | 6,400,000 |  | 6,400,000 |
Issued preference shares of 0.15144558¢ each with a liquidation preference | $ 10 |  | $ 10 |  | $ 10 |
Preference shares, par value (in usd per share) | $ 0.0015144558 |  | $ 0.0015144558 |  | $ 0.0015144558 |
Preferred shares, liquidation preference (in USD per share) | $ 25 |  | $ 25 |  | $ 25 |
Preferred Stock Dividends Rate Percentage | 7.25% |  | 7.25% |  | 7.25% |
5.95% preference shares |  |  |  |  |  |
Issued share capital: |  |  |  |  |  |
Preference shares, issued (in shares) | 11,000,000 |  | 11,000,000 |  | 11,000,000 |
Issued preference shares of 0.15144558¢ each with a liquidation preference | $ 17 |  | $ 17 |  | $ 17 |
Preference shares, par value (in usd per share) | $ 0.0015144558 |  | $ 0.0015144558 |  | $ 0.0015144558 |
Preferred shares, liquidation preference (in USD per share) | $ 25 |  | $ 25 |  | $ 25 |
Preferred Stock Dividends Rate Percentage | 5.95% |  | 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 | 10,000,000
Issued preference shares of 0.15144558¢ each with a liquidation preference | $ 15 |  | $ 15 |  | $ 15 |
Preference shares, par value (in usd per share) | $ 0.0015144558 |  | $ 0.0015144558 |  | $ 0.0015144558 |
Preferred shares, liquidation preference (in USD per share) | $ 25 |  | $ 25 |  | $ 25 | $ 25
Preferred Stock Dividends Rate Percentage | 5.625% |  | 5.625% |  | 5.625% |

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