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Interest rate on the amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

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DEBT OBLIGATIONS, NET - Schedule of Company's Debt Obligations (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) Extension	Dec. 31, 2019 USD ($) Extension	Feb. 26, 2020 USD ($) Extension	Feb. 14, 2020 USD ($)
Assets Sold under Agreements to Repurchase [Line Items]
Debt Obligations Outstanding	$ 1,726,800,000	$ 1,815,934,000
Debt obligations	5,681,020,000
Carrying Amount of Collateral	0	0
Committed Loan Repurchase Facility
Assets Sold under Agreements to Repurchase [Line Items]
Committed Financing	1,550,000,000	1,750,000,000
Debt Obligations Outstanding	537,018,000	702,264,000
Committed but Unfunded	1,012,982,000	1,047,736,000
Carrying Amount of Collateral	819,481,000	1,149,281,000
Fair Value of Collateral	820,087,000	1,152,250,000
Committed Loan Repurchase Facility \| Maturing on 19 December 2022
Assets Sold under Agreements to Repurchase [Line Items]
Committed Financing	500,000,000	600,000,000.0		$ 500,000,000.0
Debt Obligations Outstanding	191,031,000	183,828,000
Committed but Unfunded	308,969,000	416,172,000
Carrying Amount of Collateral	295,557,000	287,974,000
Fair Value of Collateral	$ 295,839,000	$ 288,210,000
Number of extension maturity periods \| Extension	2	2
Length of extension options	12 months	12 months
Committed Loan Repurchase Facility \| Maturing On February 26 2021
Assets Sold under Agreements to Repurchase [Line Items]
Committed Financing	$ 250,000,000
Debt Obligations Outstanding	0
Committed but Unfunded	250,000,000
Carrying Amount of Collateral	0
Fair Value of Collateral	$ 0
Number of extension maturity periods \| Extension	3
Length of extension options	12 months
Committed Loan Repurchase Facility \| Maturing on 19 December 2020
Assets Sold under Agreements to Repurchase [Line Items]
Committed Financing	$ 300,000,000	$ 300,000,000
Debt Obligations Outstanding	149,044,000	248,182,000
Committed but Unfunded	150,956,000	51,818,000
Carrying Amount of Collateral	231,701,000	382,778,000
Fair Value of Collateral	$ 231,701,000	$ 382,778,000
Number of extension maturity periods \| Extension	3	3
Length of extension options	364 days	364 days
Committed Loan Repurchase Facility \| Maturing on 6 November 2022
Assets Sold under Agreements to Repurchase [Line Items]
Committed Financing	$ 300,000,000	$ 300,000,000
Debt Obligations Outstanding	139,394,000	98,678,000
Committed but Unfunded	160,606,000	201,322,000
Carrying Amount of Collateral	204,671,000	175,000,000
Fair Value of Collateral	$ 204,859,000	$ 175,270,000
Number of extension maturity periods \| Extension	1	1
Length of extension options	12 months	12 months
Number of additional extension maturity periods \| Extension	2	2
Length of additional extension maturity periods	6 months	6 months
Committed Loan Repurchase Facility \| Maturing On 31 December 2022
Assets Sold under Agreements to Repurchase [Line Items]
Committed Financing	$ 100,000,000
Debt Obligations Outstanding	34,599,000
Committed but Unfunded	65,401,000
Carrying Amount of Collateral	56,952,000
Fair Value of Collateral	$ 57,088,000
Number of extension maturity periods \| Extension	2
Length of extension options	12 months
Committed Loan Repurchase Facility \| Maturing on 24 December 2020
Assets Sold under Agreements to Repurchase [Line Items]
Committed Financing	$ 100,000,000	$ 100,000,000
Debt Obligations Outstanding	22,950,000	90,927,000
Committed but Unfunded	77,050,000	9,073,000
Carrying Amount of Collateral	30,600,000	126,311,000
Fair Value of Collateral	$ 30,600,000	$ 126,311,000
Length of extension options	364 days	364 days
Committed Loan Repurchase Facility \| Maturing on 23 December 2021
Assets Sold under Agreements to Repurchase [Line Items]
Committed Financing		$ 500,000,000.0
Committed Loan Repurchase Facility \| Maturing On 24 May 2020
Assets Sold under Agreements to Repurchase [Line Items]
Committed Financing		350,000,000
Debt Obligations Outstanding		70,697,000
Committed but Unfunded		279,303,000
Carrying Amount of Collateral		101,590,000
Fair Value of Collateral		$ 103,868,000
Number of extension maturity periods \| Extension		1
Length of extension options		12 months
Committed Loan Repurchase Facility \| Maturing on 3 January 2023
Assets Sold under Agreements to Repurchase [Line Items]
Committed Financing		$ 100,000,000
Debt Obligations Outstanding		9,952,000
Committed but Unfunded		90,048,000
Carrying Amount of Collateral		75,628,000
Fair Value of Collateral		$ 75,813,000
Number of extension maturity periods \| Extension		2
Length of extension options		12 months
Committed Securities Repurchase Facility \| Maturing on 23 December 2021
Assets Sold under Agreements to Repurchase [Line Items]
Committed Financing	$ 708,969,000	$ 400,000,000.0
Debt Obligations Outstanding	477,734,000	42,751,000
Committed but Unfunded	231,235,000	357,249,000
Carrying Amount of Collateral	622,653,000	52,691,000
Fair Value of Collateral	622,653,000	52,691,000
Uncommitted Securities Repurchase Facility \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Debt Obligations Outstanding	712,048,000	1,070,919,000
Carrying Amount of Collateral	799,466,000	1,188,440,000
Fair Value of Collateral	799,466,000	1,188,440,000
Restricted securities held-to-maturity	2,200,000	2,200,000
Total Repurchase Facilities
Assets Sold under Agreements to Repurchase [Line Items]
Committed Financing	1,950,000,000	2,150,000,000
Debt Obligations Outstanding	1,726,800,000	1,815,934,000
Committed but Unfunded	1,244,217,000	1,404,985,000
Carrying Amount of Collateral	2,241,600,000	2,390,412,000
Fair Value of Collateral	2,242,206,000	2,393,381,000
Revolving Credit Facility \| Maturing February 11 2021
Assets Sold under Agreements to Repurchase [Line Items]
Committed Financing	266,430,000
Debt Obligations Outstanding	266,430,000
Committed but Unfunded	$ 0
Number of extension maturity periods \| Extension	4
Length of extension options	12 months
Revolving Credit Facility \| Maturing 11 February 2020
Assets Sold under Agreements to Repurchase [Line Items]
Committed Financing		266,430,000
Debt Obligations Outstanding		0
Committed but Unfunded		$ 266,430,000
Number of extension maturity periods \| Extension		4
Length of extension options		12 months
Mortgage Loan Financing \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Committed Financing	$ 806,153,000	$ 812,606,000
Debt Obligations Outstanding	806,153,000	812,606,000
Committed but Unfunded	0	0
Carrying Amount of Collateral	967,842,000	988,857,000
Fair Value of Collateral	1,171,170,000	1,192,106,000
Borrowings from the FHLB \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Committed Financing	1,945,795,000	1,945,795,000
Debt Obligations Outstanding	1,007,581,000	1,073,500,000
Committed but Unfunded	938,214,000	872,295,000
Carrying Amount of Collateral	1,454,039,000	1,107,188,000
Fair Value of Collateral	1,458,494,000	1,113,811,000
Restricted securities held-to-maturity	9,900,000	9,900,000
Senior Unsecured Notes
Assets Sold under Agreements to Repurchase [Line Items]
Unamortized debt issuance costs	(17,841,000)
Senior Unsecured Notes \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Debt issued	1,891,897,000	1,166,201,000
Senior Unsecured Notes	1,874,056,000	1,157,833,000
Committed but Unfunded	0	0
Unamortized debt issuance costs	(17,800,000)	(8,400,000)
Total Debt Obligations
Assets Sold under Agreements to Repurchase [Line Items]
Debt issued	6,860,275,000	6,341,032,000
Debt obligations	5,681,020,000	4,859,873,000
Committed but Unfunded	2,182,431,000	2,543,710,000
Carrying Amount of Collateral	4,663,481,000	4,486,457,000
Fair Value of Collateral	$ 4,871,870,000	$ 4,699,298,000
Minimum \| Committed Loan Repurchase Facility \| Maturing on 19 December 2022
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	2.20%	3.24%
Minimum \| Committed Loan Repurchase Facility \| Maturing On February 26 2021
Assets Sold under Agreements to Repurchase [Line Items]
Committed Financing			$ 250,000,000.0
Interest rate	0.00%
Number of extension maturity periods \| Extension			3
Minimum \| Committed Loan Repurchase Facility \| Maturing on 19 December 2020
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	2.46%	3.49%
Minimum \| Committed Loan Repurchase Facility \| Maturing on 6 November 2022
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	2.51%	3.50%
Minimum \| Committed Loan Repurchase Facility \| Maturing On 31 December 2022
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	2.83%
Minimum \| Committed Loan Repurchase Facility \| Maturing on 24 December 2020
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	2.92%	3.74%
Minimum \| Committed Loan Repurchase Facility \| Maturing on 23 December 2021
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	1.50%	2.50%
Minimum \| Committed Loan Repurchase Facility \| Maturing On 24 May 2020
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate		3.71%
Minimum \| Committed Loan Repurchase Facility \| Maturing on 3 January 2023
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate		3.96%
Minimum \| Uncommitted Securities Repurchase Facility \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	1.32%	2.17%
Minimum \| Uncommitted Securities Repurchase Facility \| Maturing February 11 2021
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	3.80%
Minimum \| Mortgage Loan Financing \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	3.75%	3.75%
Minimum \| Borrowings from the FHLB \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate		1.47%
Minimum \| Senior Unsecured Notes \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	0.54%	5.25%
Maximum \| Committed Loan Repurchase Facility \| Maturing on 19 December 2022
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	2.70%	3.74%
Maximum \| Committed Loan Repurchase Facility \| Maturing On February 26 2021
Assets Sold under Agreements to Repurchase [Line Items]
Committed Financing			$ 350,000,000.0
Interest rate	0.00%
Maximum \| Committed Loan Repurchase Facility \| Maturing on 19 December 2020
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	3.83%	3.74%
Maximum \| Committed Loan Repurchase Facility \| Maturing on 6 November 2022
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	2.81%	3.75%
Maximum \| Committed Loan Repurchase Facility \| Maturing On 31 December 2022
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	2.93%
Maximum \| Committed Loan Repurchase Facility \| Maturing on 24 December 2020
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	4.48%	3.80%
Maximum \| Committed Loan Repurchase Facility \| Maturing on 23 December 2021
Assets Sold under Agreements to Repurchase [Line Items]
Committed Financing			$ 500,000,000.0
Interest rate	3.21%	2.56%
Maximum \| Committed Loan Repurchase Facility \| Maturing On 24 May 2020
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate		3.81%
Maximum \| Committed Loan Repurchase Facility \| Maturing on 3 January 2023
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate		3.99%
Maximum \| Uncommitted Securities Repurchase Facility \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	3.75%	3.54%
Maximum \| Uncommitted Securities Repurchase Facility \| Maturing February 11 2021
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	5.25%
Maximum \| Mortgage Loan Financing \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	6.75%	6.75%
Maximum \| Borrowings from the FHLB \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate		2.95%
Maximum \| Senior Unsecured Notes \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	2.95%	5.875%