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DEBT OBLIGATIONS, NET - Additional Information (Details)										3 Months Ended			6 Months Ended		9 Months Ended	12 Months Ended
	Feb. 26, 2019 Extension	Feb. 06, 2019 USD ($)	Jul. 20, 2018	Apr. 03, 2018 USD ($)	Jan. 04, 2018	Dec. 06, 2017 USD ($)	Sep. 25, 2017 USD ($)	Mar. 16, 2017 USD ($)	Aug. 01, 2014 USD ($)	Jun. 30, 2019 USD ($) counterparty	Jun. 30, 2018 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2019 USD ($) counterparty agreement	Jun. 30, 2018 USD ($)	Sep. 30, 2018 agreement	Dec. 31, 2018 USD ($)	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										$ 1,267,371,000			$ 1,267,371,000			$ 663,685,000
Mortgage loan receivables held for investment, net, at amortized cost:
Amortization of premiums													774,000	$ 499,000
Mortgage loan and financing related to property sales		$ 6,600,000
Gain (loss) on extinguishment/defeasance of debt		$ (1,100,000)								0	$ 0		(1,070,000)	(69,000)
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet										$ 0			0			0
Proceeds from borrowings under debt obligations													$ 6,377,515,000	2,919,776,000
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Percent of FHLB advances to total debt obligations outstanding										25.80%			25.80%
Retained earnings, appropriated										$ 829,300,000			$ 829,300,000
Tuebor
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Amount restricted from transfer										1,900,000,000			1,900,000,000
Credit Agreement and Revolving Credit Facility
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Unamortized debt issuance costs										$ 8,300,000			$ 8,300,000			6,300,000
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													6		8
Mortgage loan receivables held for investment, net, at amortized cost:
Mortgage loan financing										$ 734,700,000	743,900,000		$ 734,700,000	743,900,000
Net unamortized premiums										5,500,000			5,500,000			5,800,000
Amortization of premiums										400,000	200,000		800,000	500,000
Pledged assets, real estate and lease intangibles, net										912,900,000			$ 912,900,000			$ 939,400,000
Borrowings from the Federal Home Loan Bank \| Tuebor
Committed Loan and Securities Repurchase Facilities
Debt borrowings term													5 years 3 months 18 days			5 years 9 months
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Maximum advance limit						$ 2,000,000,000.0
Advance rates of total assets						40.00%
Advance rates of total equity						150.00%
FHLB borrowings outstanding										1,200,000,000			$ 1,200,000,000			$ 1,300,000,000
Additional committed term financing available from FHLB										$ 754,300,000			$ 754,300,000			$ 647,500,000
Weighted average term													2 years 3 months 18 days			2 years 6 months
Weighted average interest rate										2.58%			2.58%			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										$ 825,900,000			$ 825,900,000			$ 1,000,000,000.0
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										669,700,000			669,700,000			$ 637,200,000
Borrowings from the Federal Home Loan Bank \| Scenario, Forecast \| Tuebor
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Maximum advance limit																		$ 750,000,000.0	$ 1,500,000,000
Senior Unsecured Notes \| Senior Notes Due 2021
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Unamortized debt issuance costs																	$ 400,000
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																	5,100,000
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Loan refinance									$ 300,000,000.0	$ 266,200,000			$ 266,200,000
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																								$ 100,000,000.0
Debt instrument, repurchase price amount																	28,200,000
Debt instrument, repurchased face amount																	$ 33,800,000
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								$ 500,000,000.0
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							$ 400,000,000.0
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										7.00%			7.00%
Maximum \| Borrowings from the Federal Home Loan Bank \| Tuebor
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Advance rates													100.00%			95.20%
Mortgage loan receivables held for investment, net, at amortized cost:
Stated interest rate on debt instrument										3.00%			3.00%			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													55.20%			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																					$ 300,000,000.0
Debt borrowings term				1 year
Revolving credit facility \| One-Month LIBOR
Committed Loan and Securities Repurchase Facilities
Committed amount on credit agreement										$ 266,400,000			$ 266,400,000
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				$ 450,000,000
Revolving credit facility \| Minimum
Committed Loan and Securities Repurchase Facilities
Committed amount on credit agreement				$ 350,000,000
Letters of credit
Committed Loan and Securities Repurchase Facilities
Committed amount on credit agreement										$ 25,000,000.0			$ 25,000,000.0
Committed Loan Repurchase Facility
Committed Loan and Securities Repurchase Facilities
Number of agreements \| agreement													6
Committed amount on credit agreement										1,800,000,000			$ 1,800,000,000
Committed financing										1,750,000,000			1,750,000,000			$ 1,750,000,000				$ 100,000,000.0
Length of additional extension maturity periods					1 year
Gross amounts of recognized liabilities										685,260,000			685,260,000			497,531,000
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet										1,044,667,000			1,044,667,000			744,310,000
Term master repurchase agreement
Committed Loan and Securities Repurchase Facilities
Committed financing										400,000,000.0			400,000,000.0
Total Repurchase Facilities
Committed Loan and Securities Repurchase Facilities
Committed financing										$ 2,150,000,000			$ 2,150,000,000			2,150,000,000
Repurchase agreements, number of counterparties \| counterparty										9			9
Gross amounts of recognized liabilities										$ 1,267,371,000			$ 1,267,371,000			663,685,000
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet										$ 1,681,905,000			$ 1,681,905,000			932,113,000
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										$ 82,400,000			$ 82,400,000
Ratio indebtedness over total equity													5.00%
Haircut on repurchase agreements										24.80%			24.80%
Uncommitted securities Repurchase Facilities \| Various Date
Committed Loan and Securities Repurchase Facilities
Gross amounts of recognized liabilities										$ 582,111,000			$ 582,111,000			166,154,000
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet										$ 637,238,000			$ 637,238,000			$ 187,803,000
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										4.06%			4.06%			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										2.99%			2.99%			2.99%
Mortgage loan financing \| Various Date
Committed Loan and Securities Repurchase Facilities
Committed financing										$ 734,652,000			$ 734,652,000			$ 743,902,000
Gross amounts of recognized liabilities										734,652,000			734,652,000			743,902,000
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet										$ 912,888,000			$ 912,888,000			$ 939,362,000
Mortgage loan financing \| Maximum \| Various Date
Collateralized Debt Obligations [Abstract]
Interest rate										7.00%			7.00%			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										$ 263,216,000			$ 263,216,000			$ 601,543,000
Gross amounts of recognized liabilities										263,216,000			263,216,000			601,543,000
Collateralized Debt Obligations [Abstract]
Unamortized debt issuance costs										1,000,000.0			1,000,000.0			2,600,000
Gross amounts offset in the balance sheet										$ 425,439,000			$ 425,439,000			$ 710,502,000						$ 431,500,000	$ 456,900,000
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										5.99%			5.99%			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										5.10%			5.10%
Participation Financing - Mortgage Loan Receivable
Committed Loan and Securities Repurchase Facilities
Gross amounts of recognized liabilities										$ 0			$ 0			$ 2,500,000
Collateralized Debt Obligations [Abstract]
Proceeds from borrowings under debt obligations												$ 4,000,000.0
Participation Financing - Mortgage Loan Receivable \| Related Reserve IV LLC \| Affiliated Entity \| B Participation Interest
Collateralized Debt Obligations [Abstract]
Interest expense, debt										100,000	$ 100,000		200,000	$ 200,000
Senior Unsecured Notes
Collateralized Debt Obligations [Abstract]
Unamortized debt issuance costs										9,801,000			9,801,000
Senior Unsecured Notes \| Various Date
Collateralized Debt Obligations [Abstract]
Unamortized debt issuance costs										9,800,000			9,800,000			11,200,000
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Loan refinance										$ 1,166,201,000			$ 1,166,201,000			$ 1,166,201,000
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%