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REAL ESTATE INVESTMENTS - Capitalized Construction Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |  |
Internal direct construction costs capitalized related to development of properties and land holdings | $ 7,431 | $ 6,964 | $ 6,063
Development |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Internal direct construction costs capitalized related to development of properties and land holdings | 3,047 | 3,185 | 4,390
Redevelopment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Internal direct construction costs capitalized related to development of properties and land holdings | 775 | 968 | 319
Tenant Improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Internal direct construction costs capitalized related to development of properties and land holdings | $ 3,609 | $ 2,811 | $ 1,354

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