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Fair Value (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Assets:        
Interest rate cap agreement $ 1 $ 14    
Liabilities:        
Contingently convertible Series E units liability 68,076 72,057 $ 74,638 $ 66,938
Preferred shares derivative liability $ 57,260 57,960 $ 55,670 $ 28,150
Senior Secured Revolving Credit Facility | LIBOR        
Fair Value Liabilities Measured On Recurring and Nonrecurring Basis        
Debt Instrument, Description of Variable Rate Basis 30 day LIBOR      
Debt Instrument, Basis Spread on Variable Rate 2.75%      
Significant Other Observable Inputs (Level 2) | Recurring        
Assets:        
Interest rate cap agreement $ 1 14    
Significant Unobservable Inputs (Level 3) | Recurring        
Liabilities:        
Contingently convertible Series E units liability 68,076 72,057    
Preferred shares derivative liability $ 57,260 $ 57,960