Fair Value (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Assets:
Interest rate cap agreement	3	$ 14
Liabilities:
Contingently convertible Series E units liability	70,219	72,057	69,694	66,938
Preferred shares derivative liability	57,840	57,960	29,849	28,150
Senior Secured Revolving Credit Facility | LIBOR
Proforma Debt Instrument [Line Items]
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	3	14
Significant Unobservable Inputs (Level 3) | Recurring
Liabilities:
Contingently convertible Series E units liability	70,219	72,057
Preferred shares derivative liability	57,840	$ 57,960