CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Residential whole loans, at carrying value, pledged as collateral (in dollars)	$ 65,894	$ 67,536
Residential whole loans, at fair value, pledged as collateral (in dollars)	$ 525,798	$ 143,072
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	8,050	8,050
Preferred stock, dividend rate	7.50%
Preferred stock, shares issued	8,000	8,000
Preferred stock, shares outstanding	8,000	8,000
Preferred stock, aggregate liquidation preference (in dollars)	$ 200,000	$ 200,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	886,950	886,950
Common stock, shares issued	370,254	370,084
Common stock, shares outstanding	370,254	370,084
Senior Notes
Stated interest rate (percent)	8.00%	8.00%
Agency Mortgage Backed Securities
Securities, at fair value, pledged as collateral	$ 4,702,437	$ 5,519,813
Non-Agency MBS
Securities, at fair value, pledged as collateral	4,873,424	2,377,343
CRT securities
Securities, at fair value, pledged as collateral	$ 118,616	$ 94,610