Fair Value - Level 3 Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Contingently convertible Series E units liability
Contingently convertible Series E units liability beginning balance	$ 69,957	$ 72,057
Conversions	(58,494)	0
Gain and remeasurement included in earnings	(11,463)	(2,100)
Contingently convertible Series E units liability end balance	0	69,957
Preferred shares derivative liability
Preferred shares derivative liability beginning balance	62,790	57,960
Conversions	0	0
Gain and remeasurement included in earnings	7,020	4,830
Preferred shares derivative liability ending balance	$ 69,810	$ 62,790