CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Stockholders' equity:
Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, authorized (in shares)	10,000,000	10,000,000
Preferred Stock, outstanding (in shares)	0	0
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, authorized (in shares)	200,000,000	200,000,000
Common Stock, outstanding (in shares)	58,981,852	58,914,802