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REAL ESTATE SOLD AND HELD FOR SALE DISCONTINUED OPERATIONS (Details) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2019 USD ($) ft² | Dec. 31, 2019 USD ($) ft² a
2019 Operating Property Sales [Member] [Domain] |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Square Footage of Real Estate Property | ft² |  | 617,000
Proceeds from Sale of Property, Plant, and Equipment |  | $ 68,500,000
Gain (Loss) on Sale of Properties |  | 41,100,000
2Q19 Operating Property Sales - World Houston 5 and Altamonte Commerce Center [Member] |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Square Footage of Real Estate Property | ft² | 237,000 |
Proceeds from Sale of Property, Plant, and Equipment | $ 18,700,000 |
Gain (Loss) on Sale of Properties | $ 11,400,000 |
Land [Member] |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Proceeds from Sale of Property, Plant, and Equipment |  | $ 185,000
Size (in acres) of land sold | a |  | 0.2
Gain on sales of land |  | $ 83,000

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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: 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 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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