Other Assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Items included in other assets
Prepaid assets	$ 44,548	$ 45,054
Straight-line rent receivables	33,177	30,374
Above-market intangible assets, net	13,010	13,263
Deferred financing costs, net	12,202	13,783
Accounts receivable, net	5,035	8,181
Goodwill	3,487	3,487
Customer relationship intangible assets, net	2,070	2,103
Equity investment in joint venture - cost method	1,266	1,266
Notes receivable, net	244	283
Allowance for uncollectible accounts	(625)	(583)
Other	1,231	1,171
Other Assets	$ 115,645	$ 118,382