CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Residential whole loans, carrying value	$ 4,847,782,000	$ 4,847,782,000
Residential whole loans, fair value	794,684,000	794,684,000
MSR-Related Assets, pledged as collateral (in dollars)	877,204,000	$ 1,217,002,000
Preferred stock, aggregate liquidation preference (in dollars)	$ 275,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	874,300,000	886,950,000
Common stock, shares issued	453,138,000	452,369,000
Common stock, shares outstanding	453,138,000	452,369,000
Collateral Pledged | Non-Agency MBS
Securities, at fair value, pledged as collateral	$ 1,331,674,000	$ 2,055,802,000
Collateral Pledged | Agency MBS
Securities, at fair value, pledged as collateral	568,704,000	1,658,614,000
Collateral Pledged | CRT securities
Securities, at fair value, pledged as collateral	$ 263,225,000	$ 252,175,000
Series B Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	8,050,000	8,050,000
Preferred stock, dividend rate (as a percent)	7.50%
Preferred stock, shares issued	8,000,000	8,000,000
Preferred stock, shares outstanding	8,000,000	8,000,000
Preferred stock, aggregate liquidation preference (in dollars)	$ 200,000,000	$ 200,000,000
Series C Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01
Preferred stock, shares authorized	12,650,000
Preferred stock, dividend rate (as a percent)	6.50%
Preferred stock, shares issued	11,000,000
Preferred stock, shares outstanding	11,000,000