DISCONTINUED OPERATIONS - Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Due to affiliate	$ 2,603		$ 2,603		$ 2,424
ACRE Capital Sale | Discontinued Operations | ACREM
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Incurred	374	$ 256	1,136	$ 795
Due to affiliate					234
ACRE Capital Sale | Management fees | Discontinued Operations | ACREM
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Incurred	154	139	446	407
Due to affiliate					144
ACRE Capital Sale | General and administrative expenses | Discontinued Operations | ACREM
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Incurred	185	113	622	368
Due to affiliate					84
ACRE Capital Sale | Direct costs | Discontinued Operations | ACREM
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Incurred	$ 35	$ 4	$ 68	$ 20
Due to affiliate					$ 6