Supplemental Detail for Certain Components of Consolidated Balance Sheets - Accounts Payable, Acquired Lease Intangibles, and Other Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accounts payable and accrued expenses
Property taxes payable	$ 23,632	$ 11,718
Accrued costs on properties under development	4,044	2,681
Mortgages, term loans, credit line - interest payable and interest rate swaps	3,859	2,360
Other items	29,945	28,706
Total accounts payable and accrued expenses	119,144	109,523
Acquired lease intangible liabilities, net
Acquired below-market leases	398,011	340,906
Accumulated amortization of acquired below-market leases	(88,346)	(72,110)
Total acquired lease intangible liabilities, net	309,665	268,796
Other liabilities
Rent received in advance and other deferred revenue	98,085	105,284
Security deposits	6,211	6,259
Capital lease obligations	5,558	5,326
Total other liabilities	109,854	116,869
Notes Payable
Accounts payable and accrued expenses
Notes payable - interest payable	$ 57,664	$ 64,058