CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 77,351	$ 84,713
Other Comprehensive Income:
Unrealized loss on Agency MBS, net	(27,291)	(3,158)
Unrealized gain on Non-Agency MBS, net	146,730	262,602
Reclassification adjustment for MBS sales included in net income	(1,360)	(2,901)
Reclassification adjustment for other-than-temporary impairments included in net income		920
Unrealized gain on derivative hedging instruments, net	12,316	12,091
Other Comprehensive Income	130,395	269,554
Comprehensive income before preferred stock dividends	207,746	354,267
Dividends declared on preferred stock	(2,040)	(2,040)
Comprehensive Income Available to Common Stock and Participating Securities	$ 205,706	$ 352,227