Fair Value - Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Liabilities:
Contingently convertible Series E units liability	$ 0	$ 69,957	$ 68,601	$ 72,057
Preferred shares derivative liability	65,730	62,790	$ 60,260	$ 57,960
Recurring
Liabilities:
Contingently convertible Series E units liability		69,957
Preferred shares derivative liability	65,730	62,790
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring
Liabilities:
Contingently convertible Series E units liability		0
Preferred shares derivative liability	0	0
Significant Other Observable Inputs (Level 2) | Recurring
Liabilities:
Contingently convertible Series E units liability		0
Preferred shares derivative liability	0	0
Significant Unobservable Inputs (Level 3) | Recurring
Liabilities:
Contingently convertible Series E units liability		69,957
Preferred shares derivative liability	$ 65,730	$ 62,790