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REAL ESTATE SOLD AND HELD FOR SALE DISCONTINUED OPERATIONS (Details) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2018 USD ($) ft² a | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) ft² a Integer
Long Lived Assets Held-for-sale [Line Items] |  |  |
Number of real estate properties transferred to held for sale and sold | Integer |  |  | 2
2017 Operating Property Sales (Stemmons Circle, Techway Southwest I-IV) [Member] |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Square Footage of Real Estate Property | ft² |  |  | 514,000
Gain (Loss) on Sale of Properties |  |  | $ 21,900,000
Proceeds from Sale of Property, Plant, and Equipment |  |  | $ 38,000,000
2018 Operating Property Sales [Member] |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Square Footage of Real Estate Property | ft² | 214,000 |  |
Gain (Loss) on Sale of Properties | $ 10,200,000 |  |
Proceeds from Sale of Property, Plant, and Equipment | $ 14,900,000 |  |
Land [Member] |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
SIze (in acres) of land sold | a | 11 |  | 19
Proceeds from Sale of Property, Plant, and Equipment | $ 2,577,000 |  | $ 3,778,000
Loss on sales of land |  | $ (40,000) |
Gain on sales of land | $ 86,000 |  | $ 293,000

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- Definition Gain on sales of land + References No definition available. + Details
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- Definition Loss on sales of land + References No definition available. + Details
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- Definition The number of real estate properties that were transferred to held for sale and sold during the period. + References No definition available. + Details
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- Definition SIze (in acres) of land sold + References No definition available. + Details
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- Definition Area of a real estate property. + References No definition available. + Details
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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Details
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- Details
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