CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Residential whole loans, fair value	$ 5,977,315	$ 5,305,349
Financial agreements held at fair value	$ 3,804,906	$ 3,266,773
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)	105,036	108,138
Common stock, shares outstanding (in shares)	105,036	108,138
Non-Agency MBS Transferred to Consolidated VIEs
Residential whole loans, at carrying value	$ 3,200,000	$ 3,000,000
Series B Preferred Stock
Preferred stock par value (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, dividend rate	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	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