DEBT OBLIGATIONS, NET - Schedule of Company's Debt Obligations (Details) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2023 USD ($) extensionOfMaturityPeriod	Dec. 31, 2022 USD ($) extensionOfMaturityPeriod
Assets Sold under Agreements to Repurchase [Line Items]
Carrying Value of Debt Obligations	$ 769,266	$ 847,863
Debt obligations	3,022,835
Carrying Amount of Collateral	0	0
Committed Loan Repurchase Facility
Assets Sold under Agreements to Repurchase [Line Items]
Committed / Principal Amount	1,200,000	1,300,000
Carrying Value of Debt Obligations	651,224	616,894
Committed but Unfunded	548,776	683,106
Carrying Amount of Collateral	906,081	860,485
Fair Value of Collateral	902,850	861,284
Committed Loan Repurchase Facility \| Maturing on 27 September 2025
Assets Sold under Agreements to Repurchase [Line Items]
Committed / Principal Amount	500,000	500,000
Carrying Value of Debt Obligations	318,983	318,983
Committed but Unfunded	181,017	181,017
Carrying Amount of Collateral	431,809	428,477
Fair Value of Collateral	$ 431,395	$ 429,276
Number of extension maturity periods \| extensionOfMaturityPeriod	2	2
Length of extension options	12 months	12 months
Committed Loan Repurchase Facility \| Maturing On February 26 2023
Assets Sold under Agreements to Repurchase [Line Items]
Committed / Principal Amount		$ 100,000
Carrying Value of Debt Obligations		0
Committed but Unfunded		100,000
Carrying Amount of Collateral		0
Fair Value of Collateral		$ 0
Number of extension maturity periods \| extensionOfMaturityPeriod		1
Length of extension options		12 months
Committed Loan Repurchase Facility \| Maturing on 19 December 2023
Assets Sold under Agreements to Repurchase [Line Items]
Committed / Principal Amount	$ 300,000	$ 300,000
Carrying Value of Debt Obligations	206,867	157,558
Committed but Unfunded	93,133	142,442
Carrying Amount of Collateral	306,449	244,102
Fair Value of Collateral	$ 303,632	$ 244,102
Number of extension maturity periods \| extensionOfMaturityPeriod	2	2
Length of extension options	364 days	364 days
Committed Loan Repurchase Facility \| Maturing on April 30 2024
Assets Sold under Agreements to Repurchase [Line Items]
Committed / Principal Amount	$ 100,000	$ 100,000
Carrying Value of Debt Obligations	47,415	47,415
Committed but Unfunded	52,585	52,585
Carrying Amount of Collateral	64,263	63,307
Fair Value of Collateral	$ 64,263	$ 63,307
Number of extension maturity periods \| extensionOfMaturityPeriod	3	3
Length of extension options	12 months	12 months
Committed Loan Repurchase Facility \| Maturing On 2 January 2024
Assets Sold under Agreements to Repurchase [Line Items]
Committed / Principal Amount	$ 100,000
Carrying Value of Debt Obligations	77,959
Committed but Unfunded	22,041
Carrying Amount of Collateral	103,560
Fair Value of Collateral	$ 103,560
Number of extension maturity periods \| extensionOfMaturityPeriod	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 / Principal Amount		$ 100,000
Carrying Value of Debt Obligations		77,959
Committed but Unfunded		22,041
Carrying Amount of Collateral		103,393
Fair Value of Collateral		103,393
Committed Loan Repurchase Facility \| Maturing On 22 January 2024
Assets Sold under Agreements to Repurchase [Line Items]
Committed / Principal Amount	$ 100,000	100,000
Carrying Value of Debt Obligations	0	0
Committed but Unfunded	100,000	100,000
Carrying Amount of Collateral	0	0
Fair Value of Collateral	$ 0	$ 0
Number of extension maturity periods \| extensionOfMaturityPeriod	2	2
Length of extension options	12 months	12 months
Committed Loan Repurchase Facility \| Maturing On 14 July 2023
Assets Sold under Agreements to Repurchase [Line Items]
Committed / Principal Amount	$ 100,000	$ 100,000
Carrying Value of Debt Obligations	0	14,979
Committed but Unfunded	100,000	85,021
Carrying Amount of Collateral	0	21,206
Fair Value of Collateral	$ 0	$ 21,206
Length of extension options	364 days	364 days
Committed Securities Repurchase Facility \| Maturing On 27 May 2024
Assets Sold under Agreements to Repurchase [Line Items]
Committed / Principal Amount	$ 100,000
Carrying Value of Debt Obligations	8,032
Committed but Unfunded	91,968
Carrying Amount of Collateral	9,150
Fair Value of Collateral	9,150
Committed Securities Repurchase Facility \| Maturing On 27 May 2023
Assets Sold under Agreements to Repurchase [Line Items]
Committed / Principal Amount		$ 100,000
Carrying Value of Debt Obligations		8,640
Committed but Unfunded		91,360
Carrying Amount of Collateral		10,023
Fair Value of Collateral		10,023
Uncommitted Securities Repurchase Facility \| Maturing On 27 April 2023
Assets Sold under Agreements to Repurchase [Line Items]
Carrying Value of Debt Obligations	110,011
Carrying Amount of Collateral	121,387
Fair Value of Collateral	121,387
Restricted securities held-to-maturity	1,900
Uncommitted Securities Repurchase Facility \| Maturing On 2 March 2023
Assets Sold under Agreements to Repurchase [Line Items]
Carrying Value of Debt Obligations		222,328
Carrying Amount of Collateral		247,351
Fair Value of Collateral		247,351
Restricted securities held-to-maturity		2,000
Total Repurchase Facilities
Assets Sold under Agreements to Repurchase [Line Items]
Committed / Principal Amount	1,300,000	1,400,000
Carrying Value of Debt Obligations	769,267	847,862
Committed but Unfunded	640,744	774,466
Carrying Amount of Collateral	1,036,618	1,117,859
Fair Value of Collateral	1,033,387	1,118,658
Revolving Credit Facility \| Maturing On 27 July 2023
Assets Sold under Agreements to Repurchase [Line Items]
Committed / Principal Amount	323,850	323,850
Carrying Value of Debt Obligations	0	0
Committed but Unfunded	$ 323,850	$ 323,850
Number of extension maturity periods \| extensionOfMaturityPeriod	4	4
Length of extension options	12 months	12 months
Mortgage Loan Financing \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Committed / Principal Amount	$ 469,385	$ 497,454
Carrying Value of Debt Obligations	469,690	497,991
Committed but Unfunded	0	0
Carrying Amount of Collateral	523,041	559,885
Fair Value of Collateral	667,818	710,977
CLO Debt
Assets Sold under Agreements to Repurchase [Line Items]
Committed / Principal Amount	1,100,000
Unamortized debt issuance costs	4,800
CLO Debt \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Committed / Principal Amount	1,064,365	1,064,365
Carrying Value of Debt Obligations	1,059,593	1,058,462
Committed but Unfunded	0	0
Carrying Amount of Collateral	1,331,079	1,308,654
Fair Value of Collateral	1,331,079	1,308,654
Unamortized debt issuance costs	4,800	5,900
Borrowings from the FHLB \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Committed / Principal Amount	213,000	213,000
Carrying Value of Debt Obligations	213,000	213,000
Committed but Unfunded	0	0
Carrying Amount of Collateral	250,747	248,806
Fair Value of Collateral	250,747	248,806
Restricted securities held-to-maturity	6,600	6,600
Senior Unsecured Notes
Assets Sold under Agreements to Repurchase [Line Items]
Unamortized debt issuance costs	14,185
Senior Unsecured Notes \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Debt issued	1,585,063	1,643,794
Senior Unsecured Notes	1,570,878	1,628,382
Committed but Unfunded	0	0
Unamortized debt issuance costs	14,200	15,400
Total Debt Obligations
Assets Sold under Agreements to Repurchase [Line Items]
Debt issued	4,955,663	5,142,463
Debt obligations	4,082,428	4,245,697
Committed but Unfunded	964,594	1,098,316
Carrying Amount of Collateral	3,141,485	3,235,204
Fair Value of Collateral	$ 3,283,031	$ 3,387,095
Minimum \| Committed Loan Repurchase Facility \| Maturing on 27 September 2025
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	6.54%	6.07%
Minimum \| Committed Loan Repurchase Facility \| Maturing On February 26 2023
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate		0.00%
Minimum \| Committed Loan Repurchase Facility \| Maturing on 19 December 2023
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	6.54%	6.19%
Minimum \| Committed Loan Repurchase Facility \| Maturing on April 30 2024
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	6.55%	6.00%
Minimum \| Committed Loan Repurchase Facility \| Maturing On 2 January 2024
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	6.06%
Minimum \| Committed Loan Repurchase Facility \| Maturing On 3 January 2023
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate		5.74%
Minimum \| Committed Loan Repurchase Facility \| Maturing On 22 January 2024
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	0.00%	0.00%
Minimum \| Committed Loan Repurchase Facility \| Maturing On 14 July 2023
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	0.00%	7.07%
Minimum \| Committed Securities Repurchase Facility \| Maturing On 27 May 2024
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	5.46%
Minimum \| Committed Securities Repurchase Facility \| Maturing On 27 May 2023
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate		5.04%
Minimum \| Uncommitted Securities Repurchase Facility \| Maturing On 27 April 2023
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	5.32%
Minimum \| Uncommitted Securities Repurchase Facility \| Maturing On 2 March 2023
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate		4.73%
Minimum \| Revolving Credit Facility \| Maturing On 27 July 2023
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	0.00%	0.00%
Minimum \| Mortgage Loan Financing \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	4.25%	4.25%
Minimum \| CLO Debt \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	5.88%	5.52%
Minimum \| Borrowings from the FHLB \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	274.00%	274.00%
Minimum \| Senior Unsecured Notes \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	4.25%	4.25%
Maximum \| Committed Loan Repurchase Facility \| Maturing on 27 September 2025
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	7.04%	6.57%
Maximum \| Committed Loan Repurchase Facility \| Maturing On February 26 2023
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate		0.00%
Maximum \| Committed Loan Repurchase Facility \| Maturing on 19 December 2023
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	7.85%	7.07%
Maximum \| Committed Loan Repurchase Facility \| Maturing on April 30 2024
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	6.55%	6.00%
Maximum \| Committed Loan Repurchase Facility \| Maturing On 2 January 2024
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	6.56%
Maximum \| Committed Loan Repurchase Facility \| Maturing On 3 January 2023
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate		6.24%
Maximum \| Committed Loan Repurchase Facility \| Maturing On 22 January 2024
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	0.00%	0.00%
Maximum \| Committed Loan Repurchase Facility \| Maturing On 14 July 2023
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	0.00%	7.07%
Maximum \| Committed Securities Repurchase Facility \| Maturing On 27 May 2024
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	5.71%
Maximum \| Committed Securities Repurchase Facility \| Maturing On 27 May 2023
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate		5.29%
Maximum \| Uncommitted Securities Repurchase Facility \| Maturing On 27 April 2023
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	6.68%
Maximum \| Uncommitted Securities Repurchase Facility \| Maturing On 2 March 2023
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate		6.00%
Maximum \| Revolving Credit Facility \| Maturing On 27 July 2023
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	0.00%	0.00%
Maximum \| Mortgage Loan Financing \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	8.53%	8.03%
Maximum \| CLO Debt \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	8.33%	7.97%
Maximum \| Borrowings from the FHLB \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	5.18%	4.70%
Maximum \| Senior Unsecured Notes \| Various Date
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate	5.25%	5.25%

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