Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Interest income:
Interest income on mortgage-backed securities	$ 96,307	$ 124,241
Interest income on short-term cash investments	282	442
Total interest income	96,589	124,683
Interest expense	38,451	53,277
Net interest margin	58,138	71,406
Operating expenses:
Management fee	4,154	4,720
Share based compensation	860	629
General and administrative	2,147	1,369
Total operating expenses	7,161	6,718
Other income (loss):
Net realized gain on sale of mortgage-backed securities	7,436	2,500
Gain (loss) on derivative instruments, net	(41,615)	51
Total other income (loss)	(34,179)	2,551
Net income	16,798	67,239
Dividends on preferred stock	5,480	5,480
Net income available to common shareholders	$ 11,318	$ 61,759
Earnings per share - common stock, basic	$ 0.12	$ 0.62
Earnings per share - common stock, diluted	$ 0.12	$ 0.62
Dividends per share of common stock	$ 0.50	$ 0.70
Weighted average common shares outstanding, basic	96,606,081	98,827,587
Weighted average common shares outstanding, diluted	96,606,081	98,827,587