Deferred Leasing Costs and Lease Intangibles, net - Future Amortization Expense For Finitle-lived Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization of above- and below-market leases, net	$ (17,593)	$ (18,062)	$ (19,734)
Deferred leasing costs and lease intangibles, net	(279,896)	(239,029)
Off-market leases, net	45,612	49,540
Below-market leases
Finite-Lived Intangible Assets [Line Items]
Amortization of above- and below-market leases, net	19,143	25,015	30,993
2019	13,296
2020	10,027
2021	7,500
2022	4,877
2023	3,965
Thereafter	5,028
Off-market leases, net	44,693	48,578
Above-market ground leases
Finite-Lived Intangible Assets [Line Items]
Amortization of above- and below-market leases, net	43	43	43
2019	43
2020	43
2021	43
2022	43
2023	43
Thereafter	704
Off-market leases, net	919	962
Deferred leasing costs and in-place lease intangibles
Finite-Lived Intangible Assets [Line Items]
Amortization of above- and below-market leases, net	46,690	72,883	84,492
2019	(40,100)
2020	(30,387)
2021	(24,099)
2022	(18,535)
2023	(15,063)
Thereafter	(84,919)
Deferred leasing costs and lease intangibles, net	(213,103)	(174,242)
Below-market ground leases
Finite-Lived Intangible Assets [Line Items]
Amortization of above- and below-market leases, net	2,465	2,548	2,203
2019	(2,504)
2020	(2,504)
2021	(2,504)
2022	(2,504)
2023	(2,504)
Thereafter	(51,464)
Deferred leasing costs and lease intangibles, net	(63,984)	(61,890)
Above-market leases
Finite-Lived Intangible Assets [Line Items]
Amortization of above- and below-market leases, net	1,550	6,953	$ 11,259
2019	(1,190)
2020	(610)
2021	(428)
2022	(250)
2023	(222)
Thereafter	(109)
Deferred leasing costs and lease intangibles, net	$ (2,809)	$ (2,897)

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, 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
-Name Accounting Standards Codification
-Topic 230
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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 350
-SubTopic 30
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-Paragraph 2
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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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