Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Consolidated Balance Sheets
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	119,618,613	118,839,393
Common stock, shares outstanding	119,618,613	118,839,393
Retained earnings, accumulated deficit eliminated upon quasi-reorganization	$ 386.1	$ 386.1