Significant Accounting Policies - Schedule of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 87,791	$ 88,594
Below-market leases, gross	(44,321)	(44,099)
Finite-lived intangible assets (liabilities), gross	43,474	44,495
Below-market lease, accumulated amortization	18,454	15,972
Finite-lived intangible assets (liabilities), accumulated amortization	(47,669)	(47,385)
Below-market leases, net	(25,867)	(28,127)
Total	(4,195)	(2,890)
In-place leases
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	83,829	84,425
Finite-lived intangible assets, accumulated amortization	(62,391)	(59,504)
Finite-lived intangible assets, net	21,438	24,921
Above-market leases
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	3,966	4,169
Finite-lived intangible assets, accumulated amortization	(3,732)	(3,853)
Finite-lived intangible assets, net	$ 234	$ 316