Supplemental Detail for Certain Components of Consolidated Balance Sheets - Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other assets, net
Prepaid expenses	$ 14,406	$ 14,258
Notes receivable issued in connection with property sales	5,390	17,905
Restricted escrow deposits	4,246	4,179
Corporate assets, net	3,585	2,313
Impounds related to mortgages payable	2,015	5,860
Other items	744	44
Total other assets	37,689	54,785
Credit Facility
Other assets, net
Credit facility origination costs, net	$ 7,303	$ 10,226