Lease Intangibles - Schedule of Intangible Assets and Liabilities Included in Other Assets and Accounts Payable and Other Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Amortizable Intangible Assets, Gross Carrying Amount	$ 297,258	$ 287,523
Amortizable Intangible Assets, Accumulated Amortization	(201,740)	(186,791)
Amortizable Intangible Assets, Net Carrying Amount	95,518	100,732
Amortizable Intangible Liabilities
Amortizable Intangible Liabilities, Gross Carrying Amount	(170,555)	(164,923)
Amortizable Intangible Liabilities, Accumulated Amortization	92,960	88,951
Amortizable Intangible Liabilities, Net Carrying Amount	(77,595)	(75,972)
Above-market Ground Lease, Gross	(671)	(671)
Above-market Ground Lease, Accumulated Amortization	254	209
Above-market Ground Lease, Net	(417)	(462)
Finite-Lived Intangible Liabilities, Gross	(171,226)	(165,594)
Finite-Lived Intangible Liabilities, Accumulated Amortization	93,214	89,160
Finite-Lived Intangible Liabilities, Net	(78,012)	(76,434)
In-place lease intangible assets
Finite-Lived Intangible Assets [Line Items]
Amortizable Intangible Assets, Gross Carrying Amount	276,187	268,335
Amortizable Intangible Assets, Accumulated Amortization	(185,871)	(171,856)
Amortizable Intangible Assets, Net Carrying Amount	90,316	96,479
Amortizable Intangible Liabilities
Amortizable Intangible Liabilities, Net Carrying Amount	(72,393)
Above-market rent
Finite-Lived Intangible Assets [Line Items]
Amortizable Intangible Assets, Gross Carrying Amount	21,071	19,188
Amortizable Intangible Assets, Accumulated Amortization	(15,869)	(14,935)
Amortizable Intangible Assets, Net Carrying Amount	$ 5,202	$ 4,253