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Fair Value - Changes in Fair Value of Level 3 Instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Preferred shares derivative liability, Beginning Balance     $ 69,810 $ 62,790
Preferred shares derivative liability, Issuance     0 0
Preferred share derivative liability, Conversion     0 0
Preferred share derivative liability, Gain and remeasurement included in earnings $ 1,640 $ 150 7,050 450
Preferred shares derivative liability, Ending Balance $ 76,860 63,240 76,860 63,240
Contingently convertible Series E units liability, Beginning Balance       69,957
Contingently convertible Series E units liability, Issuance       0
Contingently convertible Series E units liability, Conversions     $ (149,791) (58,494)
Contingently convertible Series E units liability, Gain and remeasurement included in earnings       (11,463)
Contingently convertible Series E units liability, Ending Balance   $ 0   $ 0