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Preferred Stock (Details) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 23, 2016 USD ($) | Aug. 26, 2016 € / shares shares | Aug. 19, 2016 shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |
Common shares issued on conversion of Series A preferred stock (in shares) |  | 52,976,000 | 52,976,000 |  |  |
Par value per share (EUR per share) | € / shares |  | € 0.01 |  |  |  |
Preferred stock dividend rate (percent) |  | 0.25% |  |  |  |
Increase in number of common shares of authorized capital (in shares) |  | 52,976,000 |  |  |  |
Cash payment | $ |  |  |  | $ 0 | $ 595 | $ 0
Series A Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, number of shares exchanged |  |  | 52,976,000 |  |  |
Preferred stock, outstanding (in shares) |  | 0 |  |  |  |
Number of votes per preferred share |  | 1 |  |  |  |
Preferred stock, issued (in shares) |  | 0 |  |  |  |
Cash payment | $ | $ 600 |  |  |  |  |
Limited Partnership Units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Units of partnership interest, number of shares exchanged |  |  | 52,976,000 |  |  |

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