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Weighted average interest rate of debt outstanding.

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Amount of asset associated with funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price.

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DEBT OBLIGATIONS, NET - Additional Information (Details)							3 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 ($)	Mar. 31, 2019 USD ($) counterparty agreement Extension	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2018 agreement	Dec. 31, 2018 USD ($) Extension	Jan. 01, 2021 USD ($)	Apr. 01, 2020 USD ($)	Dec. 27, 2018 USD ($)	May 07, 2018 USD ($)	Dec. 21, 2017 USD ($)	Oct. 17, 2017 USD ($)	Feb. 19, 2016
Committed Loan and Securities Repurchase Facilities
Gross amounts of recognized liabilities							$ 1,030,082,000				$ 663,686,000
Mortgage loan receivables held for investment, net, at amortized cost:
Amortization of premiums							386,000	$ 253,000
Mortgage loan and financing related to property sales		$ 6,600,000
Gain (loss) on extinguishment/defeasance of debt		$ (1,100,000)					(1,070,000)	(69,000)
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet							0				0
Proceeds from borrowings under debt obligations							$ 4,042,942,000	1,312,451,000
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Percent of FHLB advances to total debt obligations outstanding							27.30%
Retained earnings, appropriated							$ 849,000,000
Sales proceeds from non-recourse debt							15,800,000
Tuebor
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Amount restricted from transfer							1,800,000,000
Revolving credit facility
Committed Loan and Securities Repurchase Facilities
Committed amount on credit agreement															$ 300,000,000
Debt borrowings term				1 year
Revolving credit facility \| One-Month LIBOR
Committed Loan and Securities Repurchase Facilities
Committed amount on credit agreement							$ 266,430,000
Basis spread on variable rate (as a percent)			25.00%
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Number of extension maturity periods \| Extension	2						3
Length of extension options	12 months						12 months
Mortgage loan receivables held for investment, net, at amortized cost:
Stated interest rate on debt instrument (as a percent)							3.25%
Revolving credit facility \| Minimum
Committed Loan and Securities Repurchase Facilities
Committed amount on credit agreement				$ 350,000,000
Revolving credit facility \| Maximum
Committed Loan and Securities Repurchase Facilities
Committed amount on credit agreement				$ 450,000,000
Letters of credit
Committed Loan and Securities Repurchase Facilities
Committed amount on credit agreement							$ 25,000,000
Committed Loan Repurchase Facility
Committed Loan and Securities Repurchase Facilities
Committed amount on credit agreement							1,750,000,000
Committed financing							1,750,000,000				1,750,000,000			$ 100,000,000
Length of additional extension maturity periods					1 year
Gross amounts of recognized liabilities							$ 611,406,000				497,531,000
Mortgage loan receivables held for investment, net, at amortized cost:
Number of agreements \| agreement							6
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet							$ 902,725,000				744,310,000
Term master repurchase agreement
Committed Loan and Securities Repurchase Facilities
Committed financing							400,000,000
Total Repurchase Facilities
Committed Loan and Securities Repurchase Facilities
Committed financing							$ 2,150,000,000				2,150,000,000
Repurchase agreements, number of counterparties \| counterparty							8
Gross amounts of recognized liabilities							$ 1,030,082,000				663,685,000
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet							$ 1,383,995,000				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
Excess collateral over amounts borrowed under repurchase agreements							$ 82,200,000
Ratio indebtedness over total equity (as a percent)							5.00%
Haircut on repurchase agreements (as a percent)							25.80%
Uncommitted securities Repurchase Facilities \| Minimum
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Advance rates (as a percent)							75.00%
Uncommitted securities Repurchase Facilities \| Maximum
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Advance rates (as a percent)							95.00%
Participation Financing - Mortgage Loan Receivable
Committed Loan and Securities Repurchase Facilities
Gross amounts of recognized liabilities							$ 2,400,000				2,500,000
Collateralized Debt Obligations [Abstract]
Proceeds from borrowings under debt obligations									$ 4,000,000
Senior Unsecured Notes
Collateralized Debt Obligations [Abstract]
Unamortized debt issuance costs							10,509,000
2/24/2022 \| Committed Loan Repurchase Facility
Committed Loan and Securities Repurchase Facilities
Committed financing							600,000,000
Gross amounts of recognized liabilities							$ 200,501,000
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Number of extension maturity periods \| Extension							2
Length of extension options							12 months
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet							$ 278,295,000
2/24/2022 \| Committed Loan Repurchase Facility \| Minimum
Collateralized Debt Obligations [Abstract]
Interest rate							4.23%
2/24/2022 \| Committed Loan Repurchase Facility \| Maximum
Collateralized Debt Obligations [Abstract]
Interest rate							4.73%
10/1/2020 \| Committed Loan Repurchase Facility
Committed Loan and Securities Repurchase Facilities
Committed financing											600,000,000
Gross amounts of recognized liabilities											$ 180,597,000
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Number of extension maturity periods \| Extension											2
Length of extension options											12 months
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet											$ 262,642,000
10/1/2020 \| Committed Loan Repurchase Facility \| Minimum
Collateralized Debt Obligations [Abstract]
Interest rate											4.21%
10/1/2020 \| Committed Loan Repurchase Facility \| Maximum
Collateralized Debt Obligations [Abstract]
Interest rate											4.96%
Various Date \| Uncommitted securities Repurchase Facilities
Committed Loan and Securities Repurchase Facilities
Gross amounts of recognized liabilities							$ 324,827,000				$ 166,154,000
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet							$ 368,046,000				$ 187,803,000
Various Date \| Uncommitted securities Repurchase Facilities \| Minimum
Collateralized Debt Obligations [Abstract]
Interest rate							3.08%				2.99%
Various Date \| Uncommitted securities Repurchase Facilities \| Maximum
Collateralized Debt Obligations [Abstract]
Interest rate							4.23%				4.55%
Various Date \| Mortgage loan financing
Committed Loan and Securities Repurchase Facilities
Committed financing							$ 739,500,000				$ 743,902,000
Gross amounts of recognized liabilities							739,500,000				743,902,000
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet							$ 931,275,000				$ 939,362,000
Various Date \| Mortgage loan financing \| Minimum
Collateralized Debt Obligations [Abstract]
Interest rate							4.25%				4.25%
Various Date \| Mortgage loan financing \| Maximum
Collateralized Debt Obligations [Abstract]
Interest rate							7.00%				7.00%
Various Date \| CLO Debt
Committed Loan and Securities Repurchase Facilities
Committed financing							$ 497,334,000				$ 601,543,000
Gross amounts of recognized liabilities							497,334,000				601,543,000
Collateralized Debt Obligations [Abstract]
Unamortized debt issuance costs							1,900,000				2,600,000
Gross amounts offset in the balance sheet							$ 680,031,000				$ 710,502,000					$ 431,500,000	$ 456,900,000
Various Date \| CLO Debt \| Minimum
Collateralized Debt Obligations [Abstract]
Interest rate							3.36%				3.34%
Various Date \| CLO Debt \| Maximum
Collateralized Debt Obligations [Abstract]
Interest rate							6.08%				6.06%
Various Date \| CLO Debt \| Weighted Average
Collateralized Debt Obligations [Abstract]
Interest rate							4.65%
Various Date \| Borrowings from the FHLB
Committed Loan and Securities Repurchase Facilities
Committed financing							$ 1,945,795,000				$ 1,933,522,000
Gross amounts of recognized liabilities							1,291,449,000				1,286,000,000
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet							$ 1,608,381,000				$ 1,652,952,000
Various Date \| Borrowings from the FHLB \| Minimum
Collateralized Debt Obligations [Abstract]
Interest rate							1.47%				1.18%
Various Date \| Borrowings from the FHLB \| Maximum
Collateralized Debt Obligations [Abstract]
Interest rate							3.08%				3.01%
Various Date \| Senior Unsecured Notes
Collateralized Debt Obligations [Abstract]
Unamortized debt issuance costs							$ 10,500,000				$ 11,200,000
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Loan refinance							$ 1,166,201,000				$ 1,166,201,000
Various Date \| Senior Unsecured Notes \| Minimum
Mortgage loan receivables held for investment, net, at amortized cost:
Stated interest rate on debt instrument (as a percent)							5.25%				5.25%
Various Date \| Senior Unsecured Notes \| Maximum
Mortgage loan receivables held for investment, net, at amortized cost:
Stated interest rate on debt instrument (as a percent)							5.875%				5.875%
4/7/2019 \| Committed Loan Repurchase Facility
Committed Loan and Securities Repurchase Facilities
Committed financing											$ 300,000,000
Gross amounts of recognized liabilities											$ 120,631,000
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Number of extension maturity periods \| Extension											1
Length of extension options											364 days
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet											$ 204,747,000
4/7/2019 \| Committed Loan Repurchase Facility \| Minimum
Collateralized Debt Obligations [Abstract]
Interest rate											4.46%
4/7/2019 \| Committed Loan Repurchase Facility \| Maximum
Collateralized Debt Obligations [Abstract]
Interest rate											4.96%
5/6/2021 \| Committed Loan Repurchase Facility
Committed Loan and Securities Repurchase Facilities
Committed financing							$ 300,000,000				$ 300,000,000
Length of additional extension maturity periods							6 months				6 months
Gross amounts of recognized liabilities							$ 117,275,000				$ 79,886,000
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Number of extension maturity periods \| Extension							1				1
Length of extension options							12 months				12 months
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet							$ 173,142,000				$ 117,382,000
5/6/2021 \| Committed Loan Repurchase Facility \| Minimum
Collateralized Debt Obligations [Abstract]
Interest rate							4.50%				4.44%
5/6/2021 \| Committed Loan Repurchase Facility \| Maximum
Collateralized Debt Obligations [Abstract]
Interest rate							5.00%				4.94%
7/20/2021 \| Committed Loan Repurchase Facility
Committed Loan and Securities Repurchase Facilities
Committed financing							$ 100,000,000				$ 100,000,000
Gross amounts of recognized liabilities							$ 54,893,000				$ 52,738,000
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Number of extension maturity periods \| Extension							1				1
Length of extension options							12 months				12 months
Collateralized Debt Obligations [Abstract]
Gross amounts offset in the balance sheet							$ 79,822,000				$ 72,154,000
7/20/2021 \| Committed Loan Repurchase Facility \| Minimum
Collateralized Debt Obligations [Abstract]
Interest rate							4.61%				4.58%
7/20/2021 \| Committed Loan Repurchase Facility \| Maximum
Collateralized Debt Obligations [Abstract]
Interest rate							4.98%				4.96%
Non-Recourse Debt
Collateralized Debt Obligations [Abstract]
Interest expense, debt							$ 100,000
Credit Agreement and Revolving Credit Facility
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Unamortized debt issuance costs							9,000,000				$ 6,300,000
Mortgage loan financing
Mortgage loan receivables held for investment, net, at amortized cost:
Mortgage loan financing							739,500,000	$ 743,900,000
Net unamortized premiums							5,800,000
Amortization of premiums							400,000
Pledged assets, real estate and lease intangibles, net							$ 931,300,000				$ 939,400,000
Number of agreements \| agreement							2			3
Mortgage loan financing \| Minimum
Mortgage loan receivables held for investment, net, at amortized cost:
Stated interest rate on debt instrument (as a percent)							4.25%
Mortgage loan financing \| Maximum
Mortgage loan receivables held for investment, net, at amortized cost:
Stated interest rate on debt instrument (as a percent)							7.00%
Borrowings from the Federal Home Loan Bank \| Tuebor
Committed Loan and Securities Repurchase Facilities
Debt borrowings term							5 years 6 months 3 days				5 years 9 months
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Maximum advance limit						$ 2,000,000,000
Advance rates of total assets (as a percent)						40.00%
Advance rates of total equity (as a percent)						150.00%
FHLB borrowings outstanding							$ 1,300,000,000				$ 1,300,000,000
Additional committed term financing available from FHLB							$ 654,300,000				$ 647,500,000
Weighted average term							2 years 4 months 24 days				2 years 6 months
Weighted average interest rate							2.61%				2.55%
Maximum percent of FHLB advances to total assets																		40.00%
Borrowings from the Federal Home Loan Bank \| Tuebor \| Minimum
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Advance rates (as a percent)							53.90%				56.40%
Mortgage loan receivables held for investment, net, at amortized cost:
Stated interest rate on debt instrument (as a percent)							1.47%				1.18%
Borrowings from the Federal Home Loan Bank \| Tuebor \| Maximum
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract]
Advance rates (as a percent)							100.00%				95.20%
Mortgage loan receivables held for investment, net, at amortized cost:
Stated interest rate on debt instrument (as a percent)							3.08%				3.01%
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							$ 942,900,000				$ 1,000,000,000
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							660,000,000				$ 637,200,000
Affiliated Entity \| Various Date \| CLO Debt
Collateralized Debt Obligations [Abstract]
Ownership percentage																25.00%	18.50%
Scenario, Forecast \| Borrowings from the Federal Home Loan Bank \| Tuebor
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Maximum advance limit												$ 750,000,000	$ 1,500,000,000
B Participation Interest \| Affiliated Entity \| Participation Financing - Mortgage Loan Receivable \| Related Reserve IV LLC
Collateralized Debt Obligations [Abstract]
Interest expense, debt							$ 100,000
LCFH
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Ownership interest in LCFH							89.00%
LCFH \| LCFC
Borrowings from Federal Home Loan Bank (FHLB) [Abstract]
Ownership interest in LCFH							100.00%