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Investments in Real Estate - Investments in Existing Properties (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Real Estate Investments, Net [Abstract] |  |
Capitalized costs on existing properties | $ 12,300 | $ 9,500
Re-leasing costs | 2,800 | 1,200
Recurring capital expenditures | 529 | 536
Nonrecurring building improvements | $ 8,900 | $ 7,800

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- Definition Amount of land and buildings and improvements made to real estate investments and capitalized after acquisition for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column D)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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