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Fair Value - Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Liabilities: |  |  |  |
Participating preferred shares/units derivative liability | $ 68,469 | $ 69,810 | $ 65,730 | $ 62,790
Recurring |  |  |  |
Liabilities: |  |  |  |
Participating preferred shares/units derivative liability | 68,469 | 69,810 |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Liabilities: |  |  |  |
Participating preferred shares/units derivative liability | 0 | 0 |  |
Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Liabilities: |  |  |  |
Participating preferred shares/units derivative liability | 0 | 0 |  |
Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Liabilities: |  |  |  |
Participating preferred shares/units derivative liability | $ 68,469 | $ 69,810 |  |

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