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Real Estate - Real Estate Under Development and Construction in Progress (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) property | Dec. 31, 2017 USD ($) property
Property, Plant and Equipment [Line Items] |  |
Number of properties under development | property | 5 | 5
Real estate under development, beginning balance | $ 173,702 |
Transfers In | 0 |
Capitalized Costs | 18,513 |
Transfers Out | 0 |
Real estate under development, ending balance | $ 192,215 | $ 173,702
Number of unconsolidated project in development | property |  | 1
Core Portfolio |  |
Property, Plant and Equipment [Line Items] |  |
Number of properties under development | property | 2 | 2
Real estate under development, beginning balance | $ 21,897 |
Transfers In | 0 |
Capitalized Costs | 3,996 |
Transfers Out | 0 |
Real estate under development, ending balance | $ 25,893 | $ 21,897
Number of projects put into service during period | property |  | 1
Fund Portfolio | Fund II |  |
Property, Plant and Equipment [Line Items] |  |
Number of properties under development | property | 0 | 0
Real estate under development, beginning balance | $ 4,908 |
Transfers In | 0 |
Capitalized Costs | 904 |
Transfers Out | 0 |
Real estate under development, ending balance | $ 5,812 | $ 4,908
Fund Portfolio | Fund III |  |
Property, Plant and Equipment [Line Items] |  |
Number of properties under development | property | 2 | 2
Real estate under development, beginning balance | $ 63,939 |
Transfers In | 0 |
Capitalized Costs | 12,887 |
Transfers Out | 0 |
Real estate under development, ending balance | $ 76,826 | $ 63,939
Fund Portfolio | Fund IV |  |
Property, Plant and Equipment [Line Items] |  |
Number of properties under development | property | 1 | 1
Real estate under development, beginning balance | $ 82,958 |
Transfers In | 0 |
Capitalized Costs | 726 |
Transfers Out | 0 |
Real estate under development, ending balance | $ 83,684 | $ 82,958
Number of unconsolidated project in development | property |  | 4
Number of projects put into service during period | property |  | 3

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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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