SUBSEQUENT EVENTS Subsequent Events (Details) $ in Millions	1 Months Ended
	Feb. 12, 2020 USD ($) ft² a
Arlington Tech Centre land [Member]
Subsequent Event [Line Items]
Size of property in acres | a	6.7
Potential area of future development property (in square feet) | ft²	77,000
Arlington Tech Centre land [Member]
Subsequent Event [Line Items]
Purchase price of land | $	$ 1.7