Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Preferred stock, issued	0	0
Common stock, shares issued	184,499,684	183,745,789
Common stock, shares outstanding	184,499,684	183,745,789
Common stock, par value	$ 0.01	$ 0.01