Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Stockholders' equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	800,000	800,000
Common stock, shares issued	168,836	168,808
Common stock, shares outstanding	168,836	168,808
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	150,000	150,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0