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LOANS - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019		Jan. 01, 2020	Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Assets	$ 93,458,653,000		$ 93,458,653,000		$ 130,295,081,000	[1]
Loan loss provision recorded during period	68,751,000	$ 0	168,077,000	$ 5,703,000
Allowance for loan loss	206,700,000		206,700,000		20,100,000
Commercial Mortgage Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan loss provision recorded during period	22,000,000.0		74,100,000	5,700,000
Principal balance	96,900,000		175,100,000	36,600,000
Carrying value	57,800,000		95,200,000	30,900,000
Loans on nonaccrual status	101,000,000.0		101,000,000.0		175,200,000
Unfunded commitments	129,600,000		129,600,000		$ 181,400,000
Unfunded commitments, expected credit loss	5,900,000		$ 5,900,000
Loans receivable with variable rates of interest			94.00%		92.00%
Commercial Mortgage Loans | Impact of adopting CECL
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Allowance for loan loss							$ 7,800,000
Commercial Mortgage Loans | CECL provision, adjusted balance
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan loss provision recorded during period	39,100,000		$ 62,300,000
Residential Mortgage Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Assets	1,200,000,000		1,200,000,000		$ 1,600,000,000
Loans	$ 61,100,000		$ 61,100,000		$ 66,700,000
Percent of adjustable-rate loans	34.00%		34.00%		36.00%
Corporate Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan loss provision recorded during period			$ 10,000,000.0	0
Loans	$ 2,185,264,000		2,185,264,000		$ 2,144,850,000			$ 1,887,182,000
Principal balance			29,300,000
Carrying value			4,300,000
Loans on nonaccrual status	0		0		12,200,000
Debt	4,800,000		4,800,000
Allowance for loan losses, writeoffs			11,900,000
Unfunded commitments	74,900,000		74,900,000		81,200,000
Unfunded commitments, expected credit loss	800,000		$ 800,000
Corporate Loans | Impact of adopting CECL
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Allowance for loan loss							$ 29,700,000
Corporate Loans | CECL provision, adjusted balance
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan loss provision recorded during period		$ 7,600,000		$ 21,700,000
Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Senior secured loans, stated maturity (in years)			5 years
Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Senior secured loans, stated maturity (in years)			7 years
First lien loans | Corporate Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans	1,357,123,000		$ 1,357,123,000		1,396,140,000			1,346,356,000
Allowance for loan losses, writeoffs			19,600,000
Second lien loans | Corporate Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans	828,141,000		828,141,000		$ 748,710,000			$ 540,826,000
Debt	$ 2,800,000		$ 2,800,000
[1] Derived from the audited consolidated financial statements at December 31, 2019.

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