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Real Estate - Schedule of Development in Process Activities (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2022 USD ($) Property | Dec. 31, 2021 USD ($) Property | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) Property
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of properties under development | Property |  | 2 |  | 2 |  |  | 3 |
Real estate under development, beginning balance |  | $ 192,115 |  | $ 203,773 |  | $ 203,773 | $ 247,201 |
Transfers In |  | 0 |  | 29,758 |  |  |  |
Capitalized Costs |  | 1,193 |  | 8,994 |  |  |  |
Transfers Out |  | $ (12,851) |  | $ (82,180) |  |  |  |
Core Portfolio |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of properties under development | Property |  | 0 |  | 0 |  |  | 0 |
Real estate under development, beginning balance |  | $ 42,975 |  | $ 42,517 |  |  | $ 63,875 |
Transfers In |  | 0 |  | 0 |  |  |  |
Capitalized Costs |  | 458 |  | 1,855 |  |  |  |
Transfers Out |  | $ 0 |  | $ (23,213) |  |  |  |
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 |  | $ 35,502 |  | $ 35,125 |  |  | $ 74,657 |
Transfers In |  | 0 |  | 0 |  |  |  |
Capitalized Costs |  | 377 |  | 3,921 |  |  |  |
Transfers Out |  | $ 0 |  | $ (43,453) |  |  |  |
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 |  | $ 24,578 |  | $ 24,296 |  |  | $ 23,104 |
Transfers In |  | 0 |  | 0 |  |  |  |
Capitalized Costs |  | 282 |  | 1,192 |  |  |  |
Transfers Out |  | $ 0 |  | $ 0 |  |  |  |
Fund Portfolio | Fund IV |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of properties under development | Property |  | 1 | [1] | 1 | [1],[2] |  | 2 | [2]
Real estate under development, beginning balance |  | $ 89,060 | [1] | $ 101,835 | [1],[2] |  | $ 85,565 | [2]
Transfers In | [1] | 0 |  | 29,758 |  |  |  |
Capitalized Costs | [1] | 76 |  | 2,026 |  |  |  |
Transfers Out |  | $ (12,851) | [1] | $ (15,514) | [2] |  |  |
[1] | Transfers out include $12.9 million related to a portion of one Fund IV property that was transferred out of development.
[2] | Transfers in include $29.8 million related to the remaining portion of one Fund IV property that was placed in development.

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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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