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Real Estate - Schedule of Real Estate (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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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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- Definition Real estate investment property accumulated depreciation and amortization. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition The current amount of expenditures for a real estate project that has not yet been completed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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- Definition Amount of lessee's right to use underlying asset under finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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