Supplemental Detail for Certain Components of Consolidated Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Other assets, net
Loans receivable	$ 44,810	$ 35,126
Restricted escrow deposits	37,353	1,805
Notes receivable issued in connection with property sales	19,277	19,300
Prepaid expenses	12,148	9,489
Note receivable issued in connection with acquisition	8,780	8,780
Reserves for Mortgages Payable	4,722
Corporate assets, net	1,083	909
Other items	1,110	424
Total other assets	167,292	115,249
Note
Other assets, net
Deferred financing costs, net	28,768	29,687
Credit Facility
Other assets, net
Deferred financing costs, net	7,554	8,188
Mortgages
Other assets, net
Deferred financing costs, net	1,414	1,541
Term loan
Other assets, net
Deferred financing costs, net	$ 273