Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009
Member of the Board of Directors [Member]
Related Party Transaction [Line Items]
Loan to related party	$ 2.0
Term of secured, non-recourse promissory note receivable (in years)	10Y
Interest rate on note receivable from related party (in hundredths)	6.09%
Interest rate payable in cash on note receivable from related party (in hundredths)	2.00%
Affiliates of Fortress [Member]
Related Party Transaction [Line Items]
Public equity offering expenses	$ 0.6	$ 0.8