Related Party Transactions (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 years days months	Jun. 30, 2010	Dec. 31, 2010
Original Note Payable To Affiliate	$ 121,000,000		$ 121,000,000
Loan maturity date			Aug. 09, 2011
Date Of Note Payable With Affiliate			Feb. 09, 2011
Spread over LIBOR for note payable	0.85%		0.85%
Repurchase of preferred units			39,087,000	20,000,000
Interest expense, related party	328,000		526,000
Notes payable outstanding to affiliate	116,000,000		116,000,000
Debt Weighted Average Interest Rate	1.10%		1.10%
Administrative service costs	110,000	112,000	221,000	319,000
Property management contract term (in years)			seven
Extended property management contract period (in years)			one
Management fee revenue	169,000	163,000	347,000	336,000
Property management contract written notice of termination period minimum (in days)			60
Management fee expenses	13,000	12,000	26,000	23,000
Due to related parties	84,000		84,000
Due from related parties					530,000
Royalty-free license agreement written notice of termination period minimum (in months)			6
Series J [Member]
Cumulative preferred stock, dividend rate			7.500%
Repurchase of preferred units			$ 35,400,000