Summary of Significant Accounting Policies - Future Amortization of Intangibles (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Finite-Lived Intangible Assets and Liabilities [Line Items]
Total future amortization, intangible assets	$ 325,845	$ 378,218
Total future amortization, intangible liabilities	(2,107)	(4,509)
Above Market Operating Leases
Schedule of Finite-Lived Intangible Assets and Liabilities [Line Items]
2021, intangible assets	41,196
2022, intangible assets	30,272
2023, intangible assets	27,120
2024, intangible assets	24,637
2025, intangible assets	21,311
Thereafter, intangible assets	79,974
Total future amortization, intangible assets	224,510	275,814
Below Market Ground Leases & Other
Schedule of Finite-Lived Intangible Assets and Liabilities [Line Items]
2021, intangible assets	1,375
2022, intangible assets	1,367
2023, intangible assets	1,355
2024, intangible assets	1,137
2025, intangible assets	983
Thereafter, intangible assets	5,743
Total future amortization, intangible assets	11,960
Below Market Operating Leases
Schedule of Finite-Lived Intangible Assets and Liabilities [Line Items]
2021, intangible liabilities	(458)
2022, intangible liabilities	(309)
2023, intangible liabilities	(193)
2024, intangible liabilities	(186)
2025, intangible liabilities	(130)
Thereafter, intangible liabilities	(415)
Total future amortization, intangible liabilities	(1,691)	(3,653)
Above Market Ground Leases & Other
Schedule of Finite-Lived Intangible Assets and Liabilities [Line Items]
2021, intangible liabilities	(369)
2022, intangible liabilities	(21)
2023, intangible liabilities	(18)
2024, intangible liabilities	(8)
2025, intangible liabilities	0
Thereafter, intangible liabilities	0
Total future amortization, intangible liabilities	$ (416)	$ (856)