Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Interest income:
Interest income on mortgage-backed securities	$ 89,458	$ 115,115	$ 185,765	$ 239,356
Interest income on short-term cash investments	347	359	629	801
Total interest income	89,805	115,474	186,394	240,157
Interest expense	35,128	52,079	73,579	105,356
Net interest margin	54,677	63,395	112,815	134,801
Operating expenses:
Management fee	4,144	4,714	8,298	9,434
Share based compensation	842	627	1,702	1,256
General and administrative	2,324	1,602	4,471	2,971
Total operating expenses	7,310	6,943	14,471	13,661
Other income (loss):
Net realized gain (loss) on sale of mortgage-backed securities	(4,584)	8,802	2,852	11,302
Gain (loss) on derivative instruments, net	(55,260)	5,485	(96,875)	5,536
Total other income (loss)	(59,844)	14,287	(94,023)	16,838
Net income (loss)	(12,477)	70,739	4,321	137,978
Dividends on preferred stock	5,481	5,480	10,961	10,960
Net income (loss) available to common shareholders	$ (17,958)	$ 65,259	$ (6,640)	$ 127,018
Earnings (loss) per share - common stock, basic	$ (0.19)	$ 0.66	$ (0.07)	$ 1.29
Earnings (loss) per share - common stock, diluted	$ (0.19)	$ 0.66	$ (0.07)	$ 1.29
Dividends per share of common stock	$ 0.50	$ 0.70	$ 1.00	$ 1.40
Weighted average common shares outstanding, basic	96,515,599	98,830,054	96,560,590	98,828,827
Weighted average common shares outstanding, diluted	96,515,599	98,830,054	96,560,590	98,828,827