Supplemental Detail for Certain Components of Consolidated Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Other assets, net
Value of in-place leases, net	$ 160,002	$ 123,255
Value of above-market leases, net	30,579	30,081
Notes receivable issued in connection with property sales	18,958	19,025
Note receivable acquired in connection with an acquisition	8,780	8,780
Prepaid expenses	8,615	9,833
Restricted escrow deposits	4,753	50
Corporate assets, net	882	849
Loans receivable	368	2,554
Other items	1,115	2,107
Total other assets	264,647	222,635
Bond
Other assets, net
Deferred financing costs, net	20,573	22,209
Credit Facility
Other assets, net
Deferred financing costs, net	8,822	3,141
Mortgages
Other assets, net
Deferred financing costs, net	$ 1,200	$ 751