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Real Estate - Real Estate Under Development and Construction in Progress (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) property | Dec. 31, 2016 property
Property, Plant and Equipment [Line Items] |  |
Depreciation and amortization expense related to building under development demolished, Write-offs | $ 2,000 |
Number of real estate properties | property | 5 | 10
Real estate under development, beginning balance | $ 543,486 |
Transfers In | 102,930 |
Capitalized Costs | 32,400 |
Transfers Out | 505,114 |
Real estate under development, ending balance | $ 173,702 |
Core Portfolio |  |
Property, Plant and Equipment [Line Items] |  |
Number of real estate properties | property | 2 | 1
Real estate under development, beginning balance | $ 3,499 |
Transfers In | 22,422 |
Capitalized Costs | 819 |
Transfers Out | 4,843 |
Real estate under development, ending balance | $ 21,897 |
Fund Portfolio | Fund II |  |
Property, Plant and Equipment [Line Items] |  |
Number of real estate properties | property | 0 | 2
Real estate under development, beginning balance | $ 443,012 |
Transfers In | 0 |
Capitalized Costs | 6,851 |
Transfers Out | 444,955 |
Real estate under development, ending balance | $ 4,908 |
Fund Portfolio | Fund III |  |
Property, Plant and Equipment [Line Items] |  |
Number of real estate properties | property | 2 | 3
Real estate under development, beginning balance | $ 50,452 |
Transfers In | 0 |
Capitalized Costs | 22,572 |
Transfers Out | 9,085 |
Real estate under development, ending balance | $ 63,939 |
Fund Portfolio | Fund IV |  |
Property, Plant and Equipment [Line Items] |  |
Number of real estate properties | property | 1 | 4
Real estate under development, beginning balance | $ 46,523 |
Transfers In | 80,508 |
Capitalized Costs | 2,158 |
Transfers Out | 46,231 |
Real estate under development, ending balance | $ 82,958 |

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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://www.xbrl.org/2003/role/presentationRef -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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