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Real Estate - Schedule of Real Estate (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Acquisition And Disposition Of Properties And Discontinued Operations [Abstract]
Land	$ 771,508	$ 756,297
Buildings and improvements	2,822,818	2,740,479
Tenant improvements	183,361	173,686
Construction in progress	7,605	13,617
Right-of-use assets - finance leases	25,086	102,055
Right-of-use assets - operating leases, net	89,615	60,006
Total	3,899,993	3,846,140
Less: Accumulated depreciation and amortization	(552,562)	(490,227)
Operating real estate, net	3,347,431	3,355,913
Real estate under development	268,298	253,402	$ 120,297
Net investments in real estate	$ 3,615,729	$ 3,609,315

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Acquisition and disposition of properties and discontinued operations.

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Real estate investment property accumulated depreciation and amortization.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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The current amount of expenditures for a real estate project that has not yet been completed.

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Amount of lessee's right to use underlying asset under finance lease.

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Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Amount of real estate investments, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; (7) other real estate investments; (8) real estate joint ventures; and (9) unconsolidated real estate and other joint ventures not separately presented.

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Carrying amount as of the balance sheet date of improvements having a life longer than one year that were made for the benefit of one or more tenants.

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