Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Interest income:
Interest income on mortgage-backed securities	$ 131,940	$ 110,125	$ 373,420	$ 310,248
Interest income on other investments	387	380	1,160	1,051
Interest income	132,327	110,505	374,580	311,299
Interest expense	52,767	40,259	140,045	102,363
Net interest income	79,560	70,246	234,535	208,936
Operating expenses:
Management Fee	4,557	3,572	12,711	10,195
Share based compensation	447	334	1,301	735
General and administrative	1,040	688	3,269	1,992
Total operating expenses	6,044	4,594	17,281	12,922
Other income:
Gain on sale of mortgage-backed securities	10,534	13,330	25,244	17,735
Net income	84,050	78,982	242,498	213,749
Dividends on preferred stock	2,070	0	2,070	0
Net income available to common shareholders	$ 81,980	$ 78,982	$ 240,428	$ 213,749
Earnings per share - common stock, basic	$ 0.83	$ 1.04	$ 2.63	$ 3.05
Earnings per share - common stock, diluted	$ 0.83	$ 1.04	$ 2.63	$ 3.05
Dividends per share of common stock	$ 0.80	$ 1.00	$ 2.60	$ 3.00
Weighted average common shares outstanding, basic	98,233,589	75,743,002	91,296,338	70,057,263
Weighted average common shares outstanding, diluted	98,233,589	75,743,002	91,296,338	70,057,263