Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
ASSETS
Pledged Agency MBS	$ 3,506,618	$ 1,879,831
Pledged Non Agency MBS	569,016	415,195
Shareholders' Equity:
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.00
Preferred Stock, Shares Authorized	8,000,000	0
Preferred Stock, Shares Issued	2,300,000	0
Preferred Stock, Shares Outstanding	2,300,000	0
Preferred Stock, Liquidation Preference, Value		$ 0
Common stock, par value	$ 0.01	$ 0.01
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares, Issued	54,368,714	40,382,530
Common stock, shares outstanding	54,368,714	40,382,530