Acquired In-Place Leases and Above/Below Market Leases Summary of Acquired Lease Intangibles (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets, Gross [Abstract]
Acquired lease intangible assets	$ 518	$ 1,178
Net of accumulated amortization of other intangible assets	(981)	(1,115)
Below Market Lease [Abstract]
Below market leases	63,172	67,423
Accumulated accretion	(37,220)	(37,241)
Acquired lease intangible liabilities, net	25,952	30,182
In-place leases
Finite-Lived Intangible Assets, Gross [Abstract]
Acquired lease intangible assets	40,884	54,206
Net of accumulated amortization of other intangible assets	(34,603)	(45,835)
Acquired lease intangible assets, net	6,281
Above market leases
Finite-Lived Intangible Assets, Gross [Abstract]
Acquired lease intangible assets	11,963	21,262
Net of accumulated amortization of other intangible assets	(11,445)	(20,084)
Acquired lease intangible assets, net	518
Acquired lease intangible assets
Finite-Lived Intangible Assets, Gross [Abstract]
Acquired lease intangible assets, net	$ 6,799	$ 9,549