Supplemental Detail for Certain Components of Consolidated Balance Sheets - Accounts Payable, Acquired Lease Intangibles, and Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts payable and accrued expenses
Property taxes payable	$ 14,952	$ 11,718
Mortgages, term loans, credit line - interest payable and interest rate swaps	3,742	2,360
Accrued costs on properties under development	1,775	2,681
Other items	21,597	28,706
Total accounts payable and accrued expenses	92,379	109,523
Acquired lease intangible liabilities, net
Acquired below-market leases	380,586	340,906
Accumulated amortization of acquired below-market leases	(77,382)	(72,110)
Total acquired lease intangible liabilities, net	303,204	268,796
Other liabilities
Rent received in advance and other deferred revenue	111,997	105,284
Security deposits	6,304	6,259
Capital lease obligations	5,404	5,326
Total other liabilities	123,705	116,869
Notes Payable
Accounts payable and accrued expenses
Notes payable - interest payable	$ 50,313	$ 64,058