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Fair Value - Changes in Fair Value of Level 3 Instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
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   (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
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 5,410 300
Preferred shares derivative liability, Ending Balance $ 75,220 $ 63,090