Supplemental Detail for Certain Components of Consolidated Balance Sheets - Other Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other assets, net
Restricted escrow deposits	$ 23,698	$ 4,246
Prepaid expenses	13,267	14,406
Corporate assets, net	5,566	3,585
Notes receivable issued in connection with property sales	5,298	5,390
Credit facility origination costs, net	5,094	7,303
Impounds related to mortgages payable	3,465	2,015
Other items	333	744
Total other assets, net	$ 56,721	$ 37,689