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Basic and Diluted Net Income (Loss) Per Common Share (Details)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Basic and Diluted Net Income (Loss) Per Common Share [Abstract]        
Antidilutive securities excluded from computation of earnings per share, amount (in shares) 11.5 9.1 11.5 9.6