Consolidated Balance Sheets Parenthetical (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Assets:
Pledged Agency MBS	$ 1,879,831	$ 1,090,174
Pledged Non Agency MBS	$ 415,195	$ 259,350
Shareholders' Equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	40,382,530	30,342,897
Common stock, shares outstanding	40,382,530	30,342,897