Supplemental Detail for Certain Components of Consolidated Balance Sheets - Lease Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Lease intangible assets, net
Total acquired lease intangible assets, net	$ 1,308,564	$ 1,199,597
In-place leases
Lease intangible assets, net
Lease intangible assets, gross	1,400,686	1,321,979
Accumulated amortization of lease intangible assets	(587,683)	(546,573)
Above-market leases
Lease intangible assets, net
Lease intangible assets, gross	674,515	583,109
Accumulated amortization of lease intangible assets	$ (178,954)	$ (158,918)