RELATED PARTY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES (Details)						3 Months Ended	12 Months Ended
	Nov. 28, 2018	Oct. 04, 2018 USD ($)	Jun. 26, 2018 USD ($) $ / shares shares	Mar. 09, 2018 USD ($) $ / shares shares	Jan. 08, 2018 USD ($) $ / shares shares	Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) installment	Dec. 31, 2017 USD ($)
Base management fee percentage on first $500 million share capital					0.50%
Base management fee percentage in excess of $500 million share capital					0.25%
Annual reimbursement cap until 2019					$ 2,500,000
Annual reimbursement cap after 2019 until share capital exceeds of $500 million					$ 3,500,000
Renewal period of the agreement					2 years
Agreement Violation Termination Fee Includes An Amount Times Sum of Average Annual Base and Incentive Management Fee					3
Agreement Violation Termination Fee Includes An Amount Times Sum of Average Energy Capital Business Expense Reimbursement and Employee Cost Reimbursement Expense					1
Termination fee period					2 years
Consideration on disposal						$ 57,000,000	$ 57,000,000
Notes receivable						57,000,000	$ 57,000,000
Increase in receivable		$ 67,000,000
Interest rate for note							5.00%
External management fees and reimbursable expenses							$ 6,869,000	$ 0
Term of note receivable							7 years
MGM disposition
HFS loan acquired by Hunt						9,000,000	$ 9,000,000
Investment in Partnerships (SDL)
Percentage of loan amount contribution	20.00%
Hunt
Disposal Group, Consideration, Note Receivable, Quarterly Installment							$ 3,350,000
Number of quarterly payments | installment							20
Interest recognized							$ 2,900,000
Interest Receivable						0	0
Hunt | MGM disposition
HFS loan acquired by Hunt						9,000,000	9,000,000
Price of loan acquired by hunt						9,400,000
Hunt | External Management Fees and Expenses Reimbursement
Incentive fee					20.00%
External management fee, contract in excess for incentive fee.					7.00%
Expense reimbursements payable partially offset by other income							200,000
Incentive fee							0
External management fees and reimbursable expenses							6,900,000
Hunt | External Management Fees and Expenses Reimbursement | External Manager
Management fees and expense reimbursements payable						1,100,000	1,100,000
Hunt | Investment in Partnerships (SDL)
Maximum potential loan contribution						58,800,000	58,800,000
Percentage of loan amount contribution	30.00%
Amount of loan contribution						$ 10,800,000	$ 10,800,000
Hunt | Common shares in disposition
Shares issued (in shares) | shares			125,000	125,000
Shares issued			$ 4,300,000	$ 4,100,000
Purchase price (per share) | $ / shares			$ 34.00	$ 33.00
Hunt | Common shares in disposition | Private Placement
Shares issued (in shares) | shares					250,000
Purchase price (per share) | $ / shares					$ 33.50
Solar Development Lending, LLC [Member]
Percentage of loan amount contribution	50.00%