Summary of Significant Accounting Policies - Future Amortization of Deferred Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Year Ending December 31,
2021 (Remaining)	$ 34,339
2022	44,009
2023	42,124
2024	39,386
2025	37,178
Thereafter	313,686
Total	510,722
Total	(34,654)	$ (35,700)
Lease intangibles (in-place)
Year Ending December 31,
2021 (Remaining)	18,846
2022	23,341
2023	21,742
2024	20,028
2025	18,301
Thereafter	112,078
Total	214,336
Lease intangibles (above-market)
Year Ending December 31,
2021 (Remaining)	20,068
2022	25,843
2023	24,847
2024	23,154
2025	22,242
Thereafter	214,886
Total	331,040
Lease intangibles (below-market)
Year Ending December 31,
2021 (Remaining)	(4,575)
2022	(5,175)
2023	(4,465)
2024	(3,796)
2025	(3,365)
Thereafter	(13,278)
Total	$ (34,654)