CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	874,300	874,300
Common stock, shares issued (in shares)	102,082	101,916
Common stock, shares outstanding (in shares)	102,082	101,916
Non-Agency MBS Transferred to Consolidated VIEs
Residential whole loans transferred to consolidated VIEs	$ 5,700,000	$ 5,700,000
Series B Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, dividend rate (as a percent)	7.50%	7.50%
Preferred stock, shares authorized (in shares)	8,050	8,050
Preferred stock, shares issued (in shares)	8,000	8,000
Preferred stock, shares outstanding (in shares)	8,000	8,000
Preferred stock, liquidation preference, value	$ 200,000	$ 200,000
Series C Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, dividend rate (as a percent)	6.50%	6.50%
Preferred stock, shares authorized (in shares)	12,650	12,650
Preferred stock, shares issued (in shares)	11,000	11,000
Preferred stock, shares outstanding (in shares)	11,000	11,000
Preferred stock, liquidation preference, value	$ 275,000	$ 275,000
Asset Pledged as Collateral with Right
Residential whole loans, held at fair value	7,653,907	7,511,508
Asset Pledged as Collateral
Financing agreements held at fair value	$ 4,641,438	$ 4,633,660