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Real Estate - Under Development and Construction in Progress (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 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 | 13 | 14
Real estate under development, beginning balance | $ 543,486 |
Transfers In | 86,882 |
Capitalized Costs | 39,250 |
Transfers Out | 432,184 |
Real estate under development, ending balance | $ 237,434 |
Core Portfolio |  |
Property, Plant and Equipment [Line Items] |  |
Number of real estate properties | property | 2 | 1
Real estate under development, beginning balance | $ 2,530 |
Transfers In | 7,258 |
Capitalized Costs | 3,852 |
Transfers Out | 5,441 |
Real estate under development, ending balance | $ 8,199 |
Fund II | Fund Portfolio |  |
Property, Plant and Equipment [Line Items] |  |
Number of real estate properties | property | 1 | 2
Real estate under development, beginning balance | $ 443,012 |
Transfers In | 0 |
Capitalized Costs | 7,677 |
Transfers Out | 414,000 |
Real estate under development, ending balance | $ 36,689 |
Fund III | Fund Portfolio |  |
Property, Plant and Equipment [Line Items] |  |
Number of real estate properties | property | 2 | 3
Real estate under development, beginning balance | $ 51,421 |
Transfers In | 0 |
Capitalized Costs | 13,838 |
Transfers Out | 8,146 |
Real estate under development, ending balance | $ 57,113 |
Fund IV | Fund Portfolio |  |
Property, Plant and Equipment [Line Items] |  |
Number of real estate properties | property | 8 | 8
Real estate under development, beginning balance | $ 46,523 |
Transfers In | 79,624 |
Capitalized Costs | 13,883 |
Transfers Out | 4,597 |
Real estate under development, ending balance | $ 135,433 |

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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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