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Real Estate - Schedule of Development in Process Activities (Details) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) Property | Dec. 31, 2020 USD ($) Property | Dec. 31, 2019 USD ($) Property
Property, Plant and Equipment [Line Items] |  |  |
Number of properties under development | Property | 2 | 3 | 3
Real estate under development, beginning balance | $ 219,037 | $ 247,349 | $ 253,402
Transfers In | 0 | 66,812 |
Capitalized Costs | 6,263 | 8,062 |
Transfers Out | $ (34,575) | $ (80,927) |
Core Portfolio |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of properties under development | Property | 0 | 0 | 0
Real estate under development, beginning balance | $ 42,351 | $ 63,875 | $ 60,863
Transfers In | 0 | 0 |
Capitalized Costs | 1,689 | 3,012 |
Transfers Out | $ (23,213) | $ 0 |
Fund Portfolio | Fund II |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of properties under development | Property | 0 | 0 | 0
Real estate under development, beginning balance | $ 76,252 | $ 74,657 | $ 10,703
Transfers In | 0 | 66,812 |
Capitalized Costs | 1,595 | 3,612 |
Transfers Out | $ 0 | $ (6,470) |
Fund Portfolio | Fund III |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of properties under development | Property | 1 | 1 | 1
Real estate under development, beginning balance | $ 23,965 | $ 23,139 | $ 36,240
Transfers In | 0 | 0 |
Capitalized Costs | 826 | 70 |
Transfers Out | $ 0 | $ (13,171) |
Fund Portfolio | Fund IV |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of properties under development | Property | 1 | 2 | 2
Real estate under development, beginning balance | $ 76,469 | $ 85,678 | $ 145,596
Transfers In | 0 | 0 |
Capitalized Costs | 2,153 | 1,368 |
Transfers Out | $ (11,362) | $ (61,286) |

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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=120400017&loc=d3e572229-122910 + Details
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