Supplemental Detail for Certain Components of Consolidated Balance Sheets (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Other assets, net
Deferred financing costs, net	$ 22,295	$ 23,274
Restricted escrow deposits	18,300	36,540
Notes receivable issued in connection with property sales	18,243	18,342
Prepaid expenses	15,166	14,137
Impounds related to mortgages payable	4,868	5,789
Corporate assets, net	2,492	2,600
Other items	2,954	2,797
Total other assets	87,721	107,650
Credit Facility
Other assets, net
Credit facility origination costs, net	$ 3,403	$ 4,171