Fair Value - Changes in Fair Value of Level 3 Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 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
Contingently convertible Series E units liability, Issuance			0	0
Contingently convertible Series E units liability, Conversions			(69,957)	0
Contingently convertible Series E units liability, Remeasurement included in earnings	$ 0	$ 525	0	(3,456)
Contingently convertible Series E units liability, Ending Balance	0	68,601	0	68,601
Preferred shares derivative liability, Beginning Balance			62,790	57,960
Preferred shares derivative liability, Issuance			0	0
Preferred share derivative liability, Conversion			0	0
Preferred share derivative liability, Remeasurement included in earnings	2,490	3,000	2,940	2,300
Preferred shares derivative liability, Ending Balance	$ 65,730	$ 60,260	$ 65,730	$ 60,260