CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Agency MBS pledged to counterparties at fair value	$ 3,917,054,000	$ 3,925,193,000
Series B Cumulative Convertible Preferred Stock, par value	$ 0.01	$ 0.01
Series B Cumulative Convertible Preferred Stock, liquidating preference per share	$ 25.00	$ 25.00
Series B Cumulative Convertible Preferred Stock, liquidating preference	$ 15,632,000	$ 25,241,000
Series B Cumulative Convertible Preferred Stock, shares issued	1,010,000	1,010,000
Series B Cumulative Convertible Preferred Stock, shares outstanding	625,000	625,000
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, authorized	200,000,000	200,000,000
Common Stock, issued	97,497,875	95,718,000
Common Stock, outstanding	97,497,875	95,718,000
Total assets	$ 5,372,123,000	$ 5,395,776,000
Accrued interest receivable	16,864,000	16,203,000
Total liabilities	4,679,697,000	4,740,754,000
Accrued interest payable	11,516,000	11,850,000
Agency MBS
Agency MBS pledged to counterparties at fair value	3,690,344,000	3,707,062,000
Non-Agency MBS
Agency MBS pledged to counterparties at fair value	$ 558,995,000	$ 525,169,000
Series A Preferred Stock
Cumulative Preferred Stock, par value	$ 0.01	$ 0.01
Cumulative Preferred Stock, liquidating preference per share	$ 25.00	$ 25.00
Cumulative Preferred Stock, liquidating preference	$ 47,984,000	$ 47,984,000
Cumulative Preferred Stock, shares issued	1,919,378	1,919,000
Cumulative Preferred Stock, shares outstanding	1,919,378	1,919,000
Series C Preferred Stock
Cumulative Preferred Stock, par value	$ 0.01	$ 0.01
Cumulative Preferred Stock, liquidating preference per share	$ 25.00	$ 25.00
Cumulative Preferred Stock, liquidating preference	$ 39,500,000	$ 12,146,000
Cumulative Preferred Stock, shares issued	1,580,006	486,000
Cumulative Preferred Stock, shares outstanding	1,580,006	486,000
Variable Interest Entities Primary Beneficiary
Total assets	$ 698,000,000	$ 747,000,000
Accrued interest receivable	2,300,000	2,500,000
Total liabilities	688,000,000	731,000,000
Accrued interest payable	$ 2,200,000	$ 2,400,000