Supplemental Detail for Certain Components of Consolidated Balance Sheets - Lease Intangible Assets, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Lease intangible assets, net
Total acquired lease intangible assets, net	$ 1,313,798	$ 1,199,597
In-place leases
Lease intangible assets, net
Lease intangible assets, gross	1,439,816	1,321,979
Accumulated amortization of lease intangible assets	(613,053)	(546,573)
Above-market leases
Lease intangible assets, net
Lease intangible assets, gross	677,257	583,109
Accumulated amortization of lease intangible assets	$ (190,222)	$ (158,918)