Supplemental Detail for Certain Components of Consolidated Balance Sheets - Acquired Lease Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Acquired lease intangible assets, net
Acquired in-place leases	$ 1,290,704	$ 1,272,897
Accumulated amortization of acquired in-place leases	(470,345)	(444,221)
Acquired above-market leases	572,687	487,933
Accumulated amortization of acquired above-market leases	(130,794)	(121,679)
Total acquired lease intangible assets, net	$ 1,262,252	$ 1,194,930