Intangible Assets and Liabilities - Intangibles - Future Amortization (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Future Amortization of Intangible Liabilities:
Finite-lived intangible liabilities, net	$ (56,521)	$ (69,846)
Below-Market Rents
Future Amortization of Intangible Liabilities:
2021 (three months)	(4,248)
2022	(10,284)
2023	(8,662)
2024	(7,942)
2025	(7,366)
Thereafter	(16,427)
Finite-lived intangible liabilities, net	(54,929)	(68,219)
Above-Market Ground Lease
Future Amortization of Intangible Liabilities:
2021 (three months)	(12)
2022	(46)
2023	(46)
2024	(46)
2025	(46)
Thereafter	(1,396)
Finite-lived intangible liabilities, net	(1,592)	(1,627)
In-Place Leases
Future Amortization of Intangible Assets:
2021 (three months)	9,587
2022	25,871
2023	21,515
2024	17,484
2025	13,722
Thereafter	31,779
Finite-lived intangible assets, net	119,958	145,290
Above-Market Rents
Future Amortization of Intangible Assets:
2021 (three months)	1,333
2022	4,575
2023	3,748
2024	2,971
2025	1,975
Thereafter	4,922
Finite-lived intangible assets, net	19,524	24,960
Below-Market Ground Lease
Future Amortization of Intangible Assets:
2021 (three months)	69
2022	276
2023	276
2024	276
2025	276
Thereafter	15,860
Finite-lived intangible assets, net	$ 17,033	$ 17,240

Finite Lived Intangible Assets Amortization Expense After Year Four

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Finite Lived Intangible Liabilities Amortization Expense after Year Four

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Finite Lived Intangible Liabilities, Amortization Expense, Year One

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in remainder of current fiscal year.

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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