STOCKHOLDERS' EQUITY - Dividends (Details) $ / shares in Units, $ in Thousands										3 Months Ended						9 Months Ended
	Aug. 30, 2019 USD ($) $ / shares	Aug. 08, 2019 $ / shares	Jun. 04, 2019 $ / shares	Feb. 20, 2019 $ / shares	Aug. 22, 2018 $ / shares	Jun. 04, 2018 $ / shares	Mar. 06, 2018 $ / shares	Jan. 11, 2018 USD ($)	Dec. 18, 2017 $ / shares	Sep. 30, 2019 $ / shares	Jun. 30, 2019 $ / shares	Mar. 31, 2019 $ / shares	Sep. 30, 2018 $ / shares	Jun. 30, 2018 $ / shares	Mar. 31, 2018 $ / shares	Sep. 30, 2019 USD ($) property	Sep. 30, 2018 USD ($)
Dividends Payable [Line Items]
Dividends paid per common share (in usd per share)										$ 0.075	$ 0.375	$ 0.375	$ 0.375	$ 0.375	$ 0.375
Declared dividends per common share prior to reverse stock split (in usd per share)									$ 0.73
Payments of special dividends | $																$ 613,294	$ 1,575
Common Stock
Dividends Payable [Line Items]
Declared dividends per common share (in usd per share)		$ 0.075	$ 0.375	$ 0.375	$ 0.375	$ 0.375	$ 0.375
Common Stock, Excluding Private Repurchase Participants
Dividends Payable [Line Items]
Declared dividends per common share (in usd per share)									$ 2.19
Payments of special dividends | $								$ 1,575
Special Dividend
Dividends Payable [Line Items]
Dividends paid per common share (in usd per share)										$ 42.00
Special Dividend | Common Stock
Dividends Payable [Line Items]
Declared dividends per common share (in usd per share)	$ 14.00	$ 42
Dividends paid per common share (in usd per share)	$ 42.00
Payments of special dividends | $	$ 613,294
Ten Real Estate Properties Sold In 2019 | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Dividends Payable [Line Items]
Number of real estate properties sold | property																10