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Real Estate - Schedule of Real Estate (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Acquisition And Disposition Of Properties And Discontinued Operations [Abstract] |  |  |
Land | $ 777,991 | $ 776,275 |
Buildings and improvements | 2,889,285 | 2,848,781 |
Tenant improvements | 211,588 | 191,046 |
Construction in progress | 12,341 | 5,751 |
Right-of-use assets - finance leases | 25,086 | 25,086 |
Total | 3,916,291 | 3,846,939 |
Less: Accumulated depreciation and amortization | (647,718) | (586,800) |
Operating real estate, net | 3,268,573 | 3,260,139 |
Real estate under development | 219,037 | 247,349 | $ 253,402
Net investments in real estate | $ 3,487,610 | $ 3,507,488 |

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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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