Summary of Significant Accounting Policies - Future Amortization of Deferred Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Year Ending December 31,
2021 (Remaining)	$ 26,360
2022	51,434
2023	49,549
2024	46,761
2025	44,583
Thereafter	348,892
Total	567,579
Total	(33,966)	$ (35,700)
Lease intangibles (in-place)
Year Ending December 31,
2021 (Remaining)	13,785
2022	26,290
2023	24,691
2024	22,928
2025	21,190
Thereafter	125,395
Total	234,279
Lease intangibles (above-market)
Year Ending December 31,
2021 (Remaining)	15,654
2022	30,433
2023	29,437
2024	27,744
2025	26,873
Thereafter	237,125
Total	367,266
Lease intangibles (below-market)
Year Ending December 31,
2021 (Remaining)	(3,079)
2022	(5,289)
2023	(4,579)
2024	(3,911)
2025	(3,480)
Thereafter	(13,628)
Total	$ (33,966)