FAIR VALUE MEASUREMENTS (AS RESTATED) - Real Estate And Other Securities Valuation Methodology and Results (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) source	Dec. 31, 2022 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Outstanding Face Amount	$ 18,562,039	$ 18,112,783
Amortized Cost Basis	9,195,898	7,896,342
Real estate and other securities	$ 9,337,159	7,952,889	$ 9,201,474	$ 8,722,018
Number of broker quotation sources | source	2
Multiple Quotes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate and other securities	$ 9,110,673	7,952,875
Single Quote
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate and other securities	226,486	14
Agency
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Outstanding Face Amount	8,590,260	7,463,522
Amortized Cost Basis	8,417,025	7,290,473
Agency | Level 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate and other securities	8,533,130	7,338,417
Agency | Level 2 | Multiple Quotes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate and other securities	8,533,130	7,338,417
Agency | Level 2 | Single Quote
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate and other securities	0	0
Non-Agency
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Outstanding Face Amount	9,971,779	10,649,261
Amortized Cost Basis	$ 778,873	$ 605,869
Percent of securities	60.70%	49.80%
Fair Value	$ 488,314	$ 305,847
Non-Agency | Minimum | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount Rate	0.041	0.035
Non-Agency | Minimum | Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount Rate	0.000	0
Non-Agency | Minimum | CDR
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount Rate	0.004	0
Non-Agency | Minimum | Loss Severity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount Rate	0.175	0
Non-Agency | Maximum | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount Rate	0.335	0.150
Non-Agency | Maximum | Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount Rate	0.200	1.000
Non-Agency | Maximum | CDR
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount Rate	0.080	0.120
Non-Agency | Maximum | Loss Severity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount Rate	0.450	0.880
Non-Agency | Weighted Average | Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount Rate	0.063	0.075
Non-Agency | Weighted Average | Prepayment Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount Rate	0.116	0.064
Non-Agency | Weighted Average | CDR
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount Rate	0.017	0.002
Non-Agency | Weighted Average | Loss Severity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount Rate	0.327	0.072
Non-Agency | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate and other securities	$ 804,029	$ 614,472
Non-Agency | Level 3 | Multiple Quotes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate and other securities	577,543	614,458
Non-Agency | Level 3 | Single Quote
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate and other securities	$ 226,486	$ 14