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Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Assets: |  |  |  |
Interest rate cap agreement | $ 0 | $ 14 |  |
Liabilities: |  |  |  |
Contingently convertible Series E units liability | 68,601 | 72,057 | $ 71,050 | $ 66,938
Preferred shares derivative liability | 60,260 | 57,960 | $ 57,420 | $ 28,150
Significant Other Observable Inputs (Level 2) | Recurring |  |  |  |
Assets: |  |  |  |
Interest rate cap agreement | 0 | 14 |  |
Liabilities: |  |  |  |
Contingently convertible Series E units liability | 0 | 0 |  |
Preferred shares derivative liability | 0 | 0 |  |
Significant Unobservable Inputs (Level 3) | Recurring |  |  |  |
Assets: |  |  |  |
Interest rate cap agreement | 0 | 0 |  |
Liabilities: |  |  |  |
Contingently convertible Series E units liability | 68,601 | 72,057 |  |
Preferred shares derivative liability | $ 60,260 | $ 57,960 |  |

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