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SUBSEQUENT EVENTS Subsequent Events (Details) $ in Millions | 2 Months Ended |  |
--- | --- | --- | ---
Feb. 14, 2019 USD ($) | Mar. 31, 2019 USD ($) Integer | Jan. 29, 2019 ft²
$80 million senior unsecured private placement notes (2019) [Member] | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Debt, term (in years) | Integer |  | 10 |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.27% |
Unsecured debt, notional amount |  | $ 80.0 |
World Houston International Business Ctr 5 [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Size (in square feet) | ft² |  |  | 51,000
Proceeds from Sale of Property, Plant, and Equipment | $ 3.8 |  |

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