Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
ASSETS
Pledged Agency MBS	$ 2,852,363	$ 1,879,831
Pledged Non Agency MBS	$ 537,812	$ 415,195
Shareholders' Equity:
Common stock, par value	$ 0.01	$ 0.01
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares, Issued	54,366,382	40,382,530
Common stock, shares outstanding	54,366,382	40,382,530