Deferred Leasing Costs and Lease Intangibles, net - Amortization Expense For Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization expense (income) of above and below market leases	$ (9,635)	$ (12,836)	$ (17,593)
TOTAL	(285,836)	(285,448)
TOTAL	49,144	31,493
Below-market Leases
Finite-Lived Intangible Assets [Line Items]
Amortization expense (income) of above and below market leases	(10,509)	(14,076)	(19,143)
2021	7,180
2022	4,693
2023	3,799
2024	1,804
2025	842
Thereafter	29,993
TOTAL	48,311	30,617
Above-market Ground Leases
Finite-Lived Intangible Assets [Line Items]
Amortization expense (income) of above and below market leases	(43)	(43)	(43)
2021	43
2022	43
2023	43
2024	43
2025	43
Thereafter	618
TOTAL	833	876
Deferred Leasing Costs and In-place Lease Intangibles
Finite-Lived Intangible Assets [Line Items]
Amortization expense (income) of above and below market leases	41,334	45,177	46,690
2021	(33,432)
2022	(26,757)
2023	(22,243)
2024	(16,636)
2025	(11,612)
Thereafter	(115,043)
TOTAL	(225,723)	(222,399)
Below-market Ground Leases
Finite-Lived Intangible Assets [Line Items]
Amortization expense (income) of above and below market leases	2,395	2,503	2,465
2021	(2,395)
2022	(2,395)
2023	(2,395)
2024	(2,395)
2025	(2,395)
Thereafter	(47,110)
TOTAL	(59,085)	(61,480)
Above-market Leases
Finite-Lived Intangible Assets [Line Items]
Amortization expense (income) of above and below market leases	874	1,240	$ 1,550
2021	(342)
2022	(175)
2023	(147)
2024	(25)
2025	(5)
Thereafter	(334)
TOTAL	$ (1,028)	$ (1,569)

Finite-Lived Intangible Liabilities, Amortization Expense, Next Twelve Months

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Finite-Lived Intangible Liabilities, Amortization Expense, Thereafter

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Finite-Lived Intangible Liabilities, Amortization Expense, Year Five

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Finite-Lived Intangible Liabilities, Amortization Expense, Year Four

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Finite-Lived Intangible Liabilities, Amortization Expense, Year Three

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Finite-lived Intangible Liabilities, Net

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Amount of non-cash amortization of intangible asset (liability) for above and below market leases.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-Topic 230
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Amount of amortization for asset, excluding financial asset and goodwill, lacking physical substance with finite life expected to be recognized after fifth 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 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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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 fifth 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 third 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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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