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Real Estate - Schedule of Development in Process Activities (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 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 | $ 203,773 |  | $ 247,201 |  | $ 253,396 |
Transfers In | 29,758 |  | 66,812 |  |  |
Capitalized Costs | 8,994 |  | 7,920 |  |  |
Transfers Out | $ 82,180 |  | $ (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 | $ 42,517 |  | $ 63,875 |  | $ 60,863 |
Transfers In | 0 |  | 0 |  |  |
Capitalized Costs | 1,855 |  | 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 | [1] | 0 | [1]
Real estate under development, beginning balance | $ 35,125 |  | $ 74,657 | [1] | $ 10,703 | [1]
Transfers In | 0 |  | 66,812 | [1] |  |
Capitalized Costs | 3,921 |  | 3,612 | [1] |  |
Transfers Out | $ (43,453) |  | $ 6,470 | [1] |  |
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 | $ 24,296 |  | $ 23,104 |  | $ 36,240 |
Transfers In | 0 |  | 0 |  |  |
Capitalized Costs | 1,192 |  | 35 |  |  |
Transfers Out | $ 0 |  | $ (13,171) |  |  |
Fund Portfolio | Fund IV |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of properties under development | Property | 1 | [2] | 2 | [2],[3] | 2 | [3]
Real estate under development, beginning balance | $ 101,835 | [2] | $ 85,565 | [2],[3] | $ 145,590 | [3]
Transfers In | 29,758 | [2] | 0 | [3] |  |
Capitalized Costs | 2,026 | [2] | 1,261 | [3] |  |
Transfers Out | $ 15,514 | [2] | $ (61,286) | [3] |  |
[1] | Transfers in include $33.8 million of non-cash Fund II additions obtained through the conversion of a note receivable (Note 4).
[2] | Transfers in include $29.8 m illion related to the remaining portion of one Fund IV property that was placed into development.
[3] | Transfers out include impairment charges totaling $16.5 million on two Fund IV development properties (Note 9).

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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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