Fair Value - Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Assets:
Interest rate cap agreement	$ 0	$ 0
Liabilities:
Contingently convertible Series E units liability	0	69,957	$ 68,076	$ 72,057
Preferred shares derivative liability	63,240	62,790	$ 57,260	$ 57,960
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring
Assets:
Interest rate cap agreement	0	0
Liabilities:
Contingently convertible Series E units liability		0
Preferred shares derivative liability	0	0
Significant Other Observable Inputs (Level 2) | Recurring
Assets:
Interest rate cap agreement	0	0
Liabilities:
Contingently convertible Series E units liability		0
Preferred shares derivative liability	0	0
Significant Unobservable Inputs (Level 3) | Recurring
Assets:
Interest rate cap agreement	0	0
Liabilities:
Contingently convertible Series E units liability		69,957
Preferred shares derivative liability	$ 63,240	$ 62,790