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Held for Sale/Disposed Assets - Narrative (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2019 USD ($) property | Jun. 30, 2018 USD ($) property
Redevelopment property, held for sale |  |
Held For Sale Assets [Line Items] |  |
Number of buildings | property | 1 |
Held-for-sale | Miami | Redevelopment property, held for sale |  |
Held For Sale Assets [Line Items] |  |
Number of buildings | property | 1 |
Disposed of by sale | Miami |  |
Held For Sale Assets [Line Items] |  |
Sales price |  | $ 24.3
Number of properties sold | property |  | 1
Gain on sale of property |  | $ 11.7
Disposed of by sale | Los Angeles |  |
Held For Sale Assets [Line Items] |  |
Sales price | $ 12.4 |
Number of properties sold | property | 1,000,000 |
Gain on sale of property | $ 4.5 |
Disposed of by sale | Washington D.C. |  |
Held For Sale Assets [Line Items] |  |
Sales price |  | $ 20.3
Number of properties sold | property |  | 1
Gain on sale of property |  | $ 3.3
Third-party purchaser | Held-for-sale | Miami | Industrial building |  |
Held For Sale Assets [Line Items] |  |
Sales price | 14.0 |
Sales price, book value | $ 11.6 |

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- Definition The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(9)(a)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 360 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=117337411&loc=d3e23528-158515 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(7)(c)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(14)(d)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 360 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=117337397&loc=d3e23439-158514 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(a)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 360 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117337397&loc=d3e23415-158514 + Details
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