CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Residential whole loans, fair value	$ 4,093,598	$ 1,216,902
Financial agreements held at fair value	$ 2,496,584	$ 3,366,772
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	874,300	874,300
Common stock, shares issued (in shares)	440,927	451,714
Common stock, shares outstanding (in shares)	440,927	451,714
Non-Agency MBS Transferred to Consolidated VIEs
Residential whole loans, at carrying value	$ 2,300,000	$ 1,800,000
Series B Preferred Stock
Preferred stock par value (usd per share)	$ 0.01	$ 0.01
Preferred Stock, dividend rate	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 (usd per share)	$ 0.01	$ 0.01
Preferred Stock, dividend rate	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