SUBSEQUENT EVENTS Subsequent Events (Details) $ in Millions	2 Months Ended
Feb. 14, 2018 USD ($) ft² Integer
$60 million senior unsecured private placement notes (2018) [Member] \| Subsequent Event
Subsequent Event [Line Items]
Debt, term (in years) \| Integer	10
Debt Instrument, Interest Rate, Stated Percentage	3.93%
Unsecured debt, notional amount	$ 60.0
World Houston International Business Ctr 18 [Member]
Subsequent Event [Line Items]
Size (in square feet) \| ft²	33,000
Proceeds from Sale of Property, Plant, and Equipment	$ 2.5

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- Definition

Unsecured debt, notional amount

+ 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

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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=66902209&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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- Details

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