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DEBT OBLIGATIONS, NET - Additional Information (Details) $ in Thousands										3 Months Ended			9 Months Ended		12 Months Ended
	May 24, 2019	Feb. 26, 2019 Extension	Feb. 06, 2019 USD ($)	Jul. 20, 2018	Apr. 03, 2018 USD ($)	Dec. 06, 2017 USD ($)	Sep. 25, 2017 USD ($)	Mar. 16, 2017 USD ($)	Aug. 01, 2014 USD ($)	Sep. 30, 2019 USD ($) counterparty	Sep. 30, 2018 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2019 USD ($) counterparty agreement	Sep. 30, 2018 USD ($) agreement	Dec. 31, 2018 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2021 USD ($)	Apr. 01, 2020 USD ($)	Dec. 27, 2018 USD ($)	May 07, 2018 USD ($)	Dec. 21, 2017 USD ($)	Oct. 17, 2017 USD ($)	Feb. 24, 2016 USD ($)	Feb. 19, 2016
Committed Loan and Securities Repurchase Facilities
Gross amounts of recognized liabilities										$ 1,786,048			$ 1,786,048		$ 663,685
Mortgage loan receivables held for investment, net, at amortized cost:
Amortization of premiums													1,300	$ 762
Mortgage loan and financing related to property sales			$ 6,600
Gain (loss) on extinguishment/defeasance of debt			$ (1,100)							0	$ (4,323)		(1,070)	(4,392)
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet										$ 0			0		0
Proceeds from borrowings under debt obligations													$ 10,186,669	$ 4,401,648
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Percent of FHLB advances to total debt obligations outstanding										22.10%			22.10%
Retained earnings, appropriated										$ 829,300			$ 829,300
Tuebor
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Amount restricted from transfer										1,900,000			1,900,000
Credit Agreement and Revolving Credit Facility
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Unamortized debt issuance costs										$ 6,800			$ 6,800		6,300
LCFH
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Ownership interest in LCFH										89.80%			89.80%
LCFC \| LCFH
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Ownership interest in LCFH										100.00%			100.00%
Mortgage loan financing
Committed Loan and Securities Repurchase Facilities
Number of agreements \| agreement													9	11
Mortgage loan receivables held for investment, net, at amortized cost:
Mortgage loan financing										$ 723,300			$ 723,300		743,900
Net unamortized premiums										5,300			5,300		5,800
Amortization of premiums										500	300		1,300	$ 800
Pledged assets, real estate and lease intangibles, net										902,700			$ 902,700		$ 939,400
Borrowings from the Federal Home Loan Bank \| Tuebor
Committed Loan and Securities Repurchase Facilities
Debt borrowings term													5 years		5 years 9 months
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Maximum advance limit						$ 2,000,000
Advance rates of total assets						40.00%
Advance rates of total equity						150.00%
FHLB borrowings outstanding										1,100,000			$ 1,100,000		$ 1,300,000
Additional committed term financing available from FHLB										$ 869,300			$ 869,300		$ 647,500
Weighted average term													2 years 3 months 18 days		2 years 6 months
Weighted average interest rate										2.50%			2.50%		2.55%
Maximum percent of FHLB advances to total assets																								40.00%
Borrowings from the Federal Home Loan Bank \| Tuebor \| CMBS and U.S. Agency Securities
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Collateral for debt instrument										$ 721,500			$ 721,500		$ 1,000,000
Borrowings from the Federal Home Loan Bank \| Tuebor \| First mortgage commercial real estate loans
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Collateral for debt instrument										689,500			689,500		$ 637,200
Borrowings from the Federal Home Loan Bank \| Scenario, Forecast \| Tuebor
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Maximum advance limit																	$ 750,000	$ 1,500,000
Senior Unsecured Notes \| Senior Notes Due 2021
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Unamortized debt issuance costs																$ 400
Mortgage loan receivables held for investment, net, at amortized cost:
Stated interest rate on debt instrument									5.875%
Gain (loss) on extinguishment/defeasance of debt																5,100
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Loan refinance									$ 300,000	$ 266,200			$ 266,200
Debt instrument, minimum number of days to give notice for redemption without penalty									30 days
Debt instrument, maximum number of days to give notice for redemption without penalty									60 days
Debt instrument, authorized repurchase amount																							$ 100,000
Debt instrument, repurchase price amount																28,200
Debt instrument, repurchased face amount																$ 33,800
Senior Unsecured Notes \| Senior Notes Due 2022
Mortgage loan receivables held for investment, net, at amortized cost:
Stated interest rate on debt instrument								5.25%
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Loan refinance								$ 500,000
Debt instrument, minimum number of days to give notice for redemption without penalty								15 days
Debt instrument, maximum number of days to give notice for redemption without penalty								60 days
Senior Unsecured Notes \| Senior Notes Due 2025
Mortgage loan receivables held for investment, net, at amortized cost:
Stated interest rate on debt instrument							5.25%
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Loan refinance							$ 400,000
Debt instrument, minimum number of days to give notice for redemption without penalty							15 days
Debt instrument, maximum number of days to give notice for redemption without penalty							60 days
Maximum \| Mortgage loan financing
Mortgage loan receivables held for investment, net, at amortized cost:
Stated interest rate on debt instrument										6.75%			6.75%
Maximum \| Borrowings from the Federal Home Loan Bank \| Tuebor
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Advance rates													95.70%		95.20%
Mortgage loan receivables held for investment, net, at amortized cost:
Stated interest rate on debt instrument										2.95%			2.95%		3.01%
Minimum \| Mortgage loan financing
Mortgage loan receivables held for investment, net, at amortized cost:
Stated interest rate on debt instrument										4.25%			4.25%
Minimum \| Borrowings from the Federal Home Loan Bank \| Tuebor
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Advance rates													61.00%		56.40%
Mortgage loan receivables held for investment, net, at amortized cost:
Stated interest rate on debt instrument										1.47%			1.47%		1.18%
Revolving credit facility
Committed Loan and Securities Repurchase Facilities
Committed amount on credit agreement																				$ 300,000
Debt borrowings term					1 year
Revolving credit facility \| One-Month LIBOR
Committed Loan and Securities Repurchase Facilities
Committed amount on credit agreement										$ 266,400			$ 266,400
Basis spread on variable rate				25.00%
Number of extension maturity periods \| Extension		2
Length of extension options		12 months
Mortgage loan receivables held for investment, net, at amortized cost:
Stated interest rate on debt instrument										3.25%			3.25%
Revolving credit facility \| Maximum
Committed Loan and Securities Repurchase Facilities
Committed amount on credit agreement					$ 450,000
Revolving credit facility \| Minimum
Committed Loan and Securities Repurchase Facilities
Committed amount on credit agreement					$ 350,000
Letters of credit
Committed Loan and Securities Repurchase Facilities
Committed amount on credit agreement										$ 25,000			$ 25,000
Committed Loan Repurchase Facility
Committed Loan and Securities Repurchase Facilities
Number of agreements \| agreement													6
Committed amount on credit agreement										1,800,000			$ 1,800,000
Committed financing										1,750,000			1,750,000		$ 1,750,000				$ 100,000
Length of additional extension maturity periods	1 year
Gross amounts of recognized liabilities										760,521			760,521		497,531
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet										1,158,592			1,158,592		744,310
Term master repurchase agreement
Committed Loan and Securities Repurchase Facilities
Committed financing										400,000			400,000
Total Repurchase Facilities
Committed Loan and Securities Repurchase Facilities
Committed financing										$ 2,150,000			$ 2,150,000		2,150,000
Repurchase agreements, number of counterparties \| counterparty										10			10
Gross amounts of recognized liabilities										$ 1,786,048			$ 1,786,048		663,685
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet										$ 2,309,802			$ 2,309,802		932,113
Total Repurchase Facilities \| Deutshe Bank, J.P. Morgan and Wells Fargo
Committed Loan and Securities Repurchase Facilities
Repurchase agreements, number of counterparties \| counterparty										2			2
Excess collateral over amounts borrowed under repurchase agreements										$ 82,000			$ 82,000
Ratio indebtedness over total equity													5.00%
Haircut on repurchase agreements										22.80%			22.80%
Uncommitted securities Repurchase Facilities \| Various Date
Committed Loan and Securities Repurchase Facilities
Gross amounts of recognized liabilities										$ 940,070			$ 940,070		166,154
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet										$ 1,047,663			$ 1,047,663		$ 187,803
Uncommitted securities Repurchase Facilities \| Maximum
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Advance rates													95.00%
Uncommitted securities Repurchase Facilities \| Maximum \| Various Date
Collateralized Debt Obligations [Abstract]
Interest rate										3.78%			3.78%		4.55%
Uncommitted securities Repurchase Facilities \| Minimum
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Advance rates													75.00%
Uncommitted securities Repurchase Facilities \| Minimum \| Various Date
Collateralized Debt Obligations [Abstract]
Interest rate										2.45%			2.45%		2.99%
Mortgage loan financing \| Various Date
Committed Loan and Securities Repurchase Facilities
Committed financing										$ 723,313			$ 723,313		$ 743,902
Gross amounts of recognized liabilities										723,313			723,313		743,902
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet										$ 902,656			$ 902,656		$ 939,362
Mortgage loan financing \| Maximum \| Various Date
Collateralized Debt Obligations [Abstract]
Interest rate										6.75%			6.75%		7.00%
Mortgage loan financing \| Minimum \| Various Date
Collateralized Debt Obligations [Abstract]
Interest rate										4.25%			4.25%		4.25%
CLO Debt \| Various Date
Committed Loan and Securities Repurchase Facilities
Committed financing										$ 117,760			$ 117,760		$ 601,543
Gross amounts of recognized liabilities										117,760			117,760		601,543
Collateralized Debt Obligations [Abstract]
Unamortized debt issuance costs										400			400		2,600
Gross amounts offset in the balance sheet										$ 274,149			$ 274,149		$ 710,502						$ 431,500	$ 456,900
CLO Debt \| Affiliated Entity \| Various Date
Collateralized Debt Obligations [Abstract]
Ownership percentage																					25.00%	18.50%
CLO Debt \| Maximum \| Various Date
Collateralized Debt Obligations [Abstract]
Interest rate										5.62%			5.62%		6.06%
CLO Debt \| Minimum \| Various Date
Collateralized Debt Obligations [Abstract]
Interest rate										3.40%			3.40%		3.34%
CLO Debt \| Weighted Average \| Various Date
Collateralized Debt Obligations [Abstract]
Interest rate										4.97%			4.97%
Participation Financing - Mortgage Loan Receivable
Committed Loan and Securities Repurchase Facilities
Gross amounts of recognized liabilities										$ 0			$ 0		$ 2,500
Collateralized Debt Obligations [Abstract]
Proceeds from borrowings under debt obligations												$ 4,000
Participation Financing - Mortgage Loan Receivable \| Related Reserve IV LLC \| Affiliated Entity \| B Participation Interest
Collateralized Debt Obligations [Abstract]
Interest expense, debt											$ 100		200	$ 400
Senior Unsecured Notes
Collateralized Debt Obligations [Abstract]
Unamortized debt issuance costs										9,084			9,084
Senior Unsecured Notes \| Various Date
Collateralized Debt Obligations [Abstract]
Unamortized debt issuance costs										9,100			9,100		11,200
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Loan refinance										$ 1,166,201			$ 1,166,201		$ 1,166,201
Senior Unsecured Notes \| Maximum \| Various Date
Collateralized Debt Obligations [Abstract]
Interest rate										5.875%			5.875%		5.875%
Senior Unsecured Notes \| Minimum \| Various Date
Collateralized Debt Obligations [Abstract]
Interest rate										5.25%			5.25%		5.25%