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Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Assets:        
Interest rate cap agreement $ 0 $ 14    
Liabilities:        
Contingently convertible Series E units liability 68,601 72,057 $ 71,050 $ 66,938
Preferred shares derivative liability 60,260 57,960 $ 57,420 $ 28,150
Significant Other Observable Inputs (Level 2) | Recurring        
Assets:        
Interest rate cap agreement 0 14    
Liabilities:        
Contingently convertible Series E units liability 0 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 68,601 72,057    
Preferred shares derivative liability $ 60,260 $ 57,960