DISCONTINUED OPERATIONS (Assets and Liabilities of Discontinued Operations) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gains on disposal	$ 13,400	$ 33,410	$ 0
ASSETS
Cash and cash equivalents	28,243	28,243	35,693
Restricted cash	5,635	5,635	44,766
Investments in debt securities	97,190	97,190	143,604
Investments in partnerships	155,079	155,079	227,962
Other assets	10,940	10,940	17,895
Total assets	364,386	364,386	531,886
LIABILITIES
Debt	149,187	149,187	216,139
Accounts payable and accrued expenses	2,289	2,289	6,098
Other liabilities			57,332
Total liabilities	151,476	151,476	304,784
Discontinued Operations, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gains on disposal			251
ASSETS
Cash and cash equivalents			3,654
Restricted cash			16,073
Investments in debt securities			5,450
Investments in partnerships			4,456
Real Estate Investments, Net			23,944
Other assets			7,653
Total assets			61,230
LIABILITIES
Debt			8,308
Accounts payable and accrued expenses			3,454
Other liabilities			5,450
Total liabilities			$ 17,212
MGM disposition
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Sale of Loans Held-for-sale	9,400
Loan acquired	$ 9,000	$ 9,000