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Real Estate - Schedule of Development in Process Activities (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) property | Dec. 31, 2018 USD ($) property
Property, Plant and Equipment [Line Items] |  |  |
Number of properties under development | property | 3 | 3 | 3
Real estate under development, beginning balance | $ 237,831 | $ 253,402 | $ 120,297
Transfers In | 0 | 117,344 |
Capitalized Costs | 4,566 | 25,580 |
Transfers Out | $ 20,137 | $ 9,819 |
Core Portfolio |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of properties under development | property | 0 | 0 | 1
Real estate under development, beginning balance | $ 61,775 | $ 60,863 | $ 7,759
Transfers In | 0 | 57,342 |
Capitalized Costs | 912 | 5,581 |
Transfers Out | $ 0 | $ 9,819 |
Fund Portfolio | Fund II |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of properties under development | property | 0 | 0 | 0
Real estate under development, beginning balance | $ 10,333 | $ 10,703 | $ 7,462
Transfers In | 0 | 0 |
Capitalized Costs | 616 | 3,241 |
Transfers Out | $ 986 | $ 0 |
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 | $ 24,379 | $ 36,240 | $ 21,242
Transfers In | 0 | 12,313 |
Capitalized Costs | 572 | 2,685 |
Transfers Out | $ 12,433 | $ 0 |
Fund Portfolio | Fund IV |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of properties under development | property | 2 | 2 | 1
Real estate under development, beginning balance | $ 141,344 | $ 145,596 | $ 83,834
Transfers In | 0 | 47,689 |
Capitalized Costs | 2,466 | 14,073 |
Transfers Out | $ 6,718 | $ 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=119400593&loc=d3e572229-122910 + Details
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