Investment in Joint Venture (Details Textual) (USD $)				0 Months Ended
	Jun. 30, 2013 properties	Dec. 31, 2012	Jul. 29, 2011	Apr. 11, 2013 Manhattan Collection Joint Venture [Member]	Dec. 28, 2012 Manhattan Collection Joint Venture [Member]	Jun. 30, 2013 Manhattan Collection Joint Venture [Member] properties	Dec. 27, 2012 Manhattan Collection Joint Venture [Member]	Jul. 29, 2011 Manhattan Collection Joint Venture [Member] properties	Dec. 27, 2012 First Mortgage [Member] Manhattan Collection Joint Venture [Member]	Apr. 04, 2013 Second Mortgage [Member] Manhattan Collection Joint Venture [Member]
Investment in Joint Venture (Textual) [Abstract]
Equity interest issued in a joint venture						49.00%
Number of properties owned	26					6		6
Transaction Values Of Investment In Joint Venture			$ 908,000,000
Debt Instrument, Face Amount	428,942,000	366,010,000							410,000,000	50,000,000
Debt Instrument, Interest Rate, Stated Percentage									3.673%	3.14%
Related Party Transaction, Rate					9.75%
Proceeds from Equity Method Investment, Dividends or Distributions				23,000,000
Due to Affiliate							50,000,000
Equity Method Investment, Summarized Financial Information [Abstract]
Total assets						505,300,000
Total liabilities and members' deficit - existing first mortgage debt						460,000,000
Total liabilities and members' deficit - unsecured special loan						50,000,000
Total liabilities and members' deficit - preferred capital						$ 40,000,000