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Real Estate - Schedule of Development in Process Activities (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) property | Dec. 31, 2017 USD ($) property
Property, Plant and Equipment [Line Items] |  |
Number of properties under development | property | 3 | 5
Real estate under development | $ 120,297 | $ 173,702
Transfers In | 0 |
Capitalized Costs | 45,867 |
Transfers Out | $ 99,272 |
Core Portfolio |  |
Property, Plant and Equipment [Line Items] |  |
Number of properties under development | property | 1 | 2
Real estate under development | $ 7,759 | $ 21,897
Transfers In | 0 |
Capitalized Costs | 6,320 |
Transfers Out | $ 20,458 |
Fund Portfolio | Fund II |  |
Property, Plant and Equipment [Line Items] |  |
Number of properties under development | property | 0 | 0
Real estate under development | $ 7,462 | $ 4,908
Transfers In | 0 |
Capitalized Costs | 2,554 |
Transfers Out | $ 0 |
Fund Portfolio | Fund III |  |
Property, Plant and Equipment [Line Items] |  |
Number of properties under development | property | 1 | 2
Real estate under development | $ 21,242 | $ 63,939
Transfers In | 0 |
Capitalized Costs | 36,117 |
Transfers Out | $ 78,814 |
Fund Portfolio | Fund IV |  |
Property, Plant and Equipment [Line Items] |  |
Number of properties under development | property | 1 | 1
Real estate under development | $ 83,834 | $ 82,958
Transfers In | 0 |
Capitalized Costs | 876 |
Transfers Out | $ 0 |

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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=6879938&loc=d3e572229-122910 + Details
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