CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Agency MBS pledged to counterparties at fair value	$ 4,280,534,000	$ 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	$ 16,163,000	$ 25,241,000
Series B Cumulative Convertible Preferred Stock, shares issued	646,538	1,010,000
Series B Cumulative Convertible Preferred Stock, shares outstanding	646,538	1,010,000
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, authorized	200,000,000	200,000,000
Common Stock, issued	97,843,808	95,718,000
Common Stock, outstanding	97,843,808	95,718,000
Total assets	$ 5,783,787,000	$ 5,395,776,000
Accrued interest receivable	18,007,000	16,203,000
Total liabilities	5,083,619,000	4,740,754,000
Accrued interest payable	12,690,000	11,850,000
Agency MBS
Agency MBS pledged to counterparties at fair value	4,055,409,000	3,707,062,000
Non-Agency MBS
Agency MBS pledged to counterparties at fair value	$ 618,259,000	$ 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	1,919,378
Cumulative Preferred Stock, shares outstanding	1,919,378	1,919,378
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	$ 45,091,000	$ 12,146,000
Cumulative Preferred Stock, shares issued	1,803,638	486,000
Cumulative Preferred Stock, shares outstanding	1,803,638	486,000
Variable Interest Entities Primary Beneficiary
Total assets	$ 670,000,000	$ 747,000,000
Accrued interest receivable	2,200,000	2,500,000
Total liabilities	661,000,000	731,000,000
Accrued interest payable	$ 2,200,000	$ 2,400,000