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SIGNIFICANT ACCOUNTING POLICIES (Details) $ / shares in Units, $ in Thousands			3 Months Ended
		Jan. 01, 2020 USD ($) loans $ / shares	Mar. 31, 2020 USD ($) loan	Mar. 31, 2020 USD ($)	Mar. 31, 2020 USD ($) loans	Mar. 31, 2019 USD ($)	May 01, 2020 USD ($)	Apr. 30, 2020 USD ($)	Apr. 28, 2020 USD ($)	[1]	Apr. 27, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cash, cash equivalents and restricted cash			$ 622,221	$ 622,221	$ 622,221	$ 125,233						$ 355,746	$ 98,450
Debt obligations, net	[1]		5,681,020	5,681,020	5,681,020							4,859,873
Amortization of premium on mortgage loan financing				(309)		(386)
General CECL Reserve			49,457	49,457	49,457							$ 20,500
Provision expense for current expected credit loss (implementation impact)				17,993		$ 300
Individually impaired loans			81,316	81,316	81,316
Accounting Standards Update 2016-13
Error Corrections and Prior Period Adjustments Restatement [Line Items]
General CECL Reserve		$ 11,600	$ 30,200	30,200	$ 30,200
Percentage of total loan portfolio		0.36%
Carrying value of held for investment loan portfolio		$ 3,200,000
Loans that previously had asset-specific reserves		3	4		5
Provision expense for current expected credit loss (implementation impact)		$ 5,800
Book value of common stock (in usd per share) | $ / shares		$ 0.05
Additional CECL reserve recorded			$ 18,600	18,600	$ 18,600
Accounting Standards Update 2016-13 | Asset Specific Reserve, Company Loan
Error Corrections and Prior Period Adjustments Restatement [Line Items]
General CECL Reserve		$ 14,700	$ 20,700	$ 20,700	$ 20,700
Aggregate amount of loan specific reserves		7,500
Carrying value of financing receivable		$ 39,800
Subsequent Event
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cash, cash equivalents and restricted cash							$ 830,000
Debt obligations, net							$ 783,000		$ 830,000
Secured Debt | Non-Recourse Notes | Subsequent Event | Koch Real Estate Investments, LLC
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Non-mark to market financing facility								$ 206,400
CLO Debt | Non-Recourse Notes | Subsequent Event
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Debt obligations, net											$ 310,200
[1] Includes amounts relating to consolidated variable interest entities. See Note 1.

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