Supplemental Detail for Certain Components of Consolidated Balance Sheets - Lease Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Lease intangible assets, net
Total acquired lease intangible assets, net	$ 1,205,147	$ 1,199,597
In-place leases
Lease intangible assets, net
Lease intangible assets, gross	1,353,301	1,321,979
Accumulated amortization of lease intangible assets	(569,405)	(546,573)
Above-market leases
Lease intangible assets, net
Lease intangible assets, gross	589,908	583,109
Accumulated amortization of lease intangible assets	$ (168,657)	$ (158,918)