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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
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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

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