Supplemental Detail for Certain Components of Consolidated Balance Sheets - Acquired Lease Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Acquired lease intangible assets, net
Acquired in-place leases	$ 1,272,897	$ 1,164,075
Accumulated amortization of acquired in-place leases	(444,221)	(358,040)
Acquired above-market leases	487,933	365,005
Accumulated amortization of acquired above-market leases	(121,679)	(88,720)
Total acquired lease intangible assets, net	$ 1,194,930	$ 1,082,320