Supplemental Detail for Certain Components of Consolidated Balance Sheets - Acquired Lease Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Acquired lease intangible assets, net
Acquired in-place leases	$ 1,227,780	$ 1,164,075
Accumulated amortization of acquired in-place leases	(428,802)	(358,040)
Acquired above-market leases	479,098	365,005
Accumulated amortization of acquired above-market leases	(113,063)	(88,720)
Total acquired lease intangible assets, net	$ 1,165,013	$ 1,082,320