Fair Value - Changes in Fair Value of Level 3 Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Contingently convertible Series E units liability, Beginning Balance			$ 69,957	$ 72,057
Convertible Series E Units Liability Issuance			0	0
Conversion of Series E units to Series D units.			(69,957)	0
Remeasurement of Series E units	$ 0	$ (2,143)	0	(3,981)
Contingently convertible Series E units liability, Ending Balance	0	68,076	0	68,076
Preferred shares derivative liability, Beginning Balance			62,790	57,960
Preferred shares derivative liability, Issuance			0	0
Preferred share conversions			0	0
Remeasurement of preferred shares	150	(580)	450	(700)
Preferred shares derivative liability, Ending Balance	$ 63,240	$ 57,260	$ 63,240	$ 57,260