Rumors of a buyout offer and better-than-expected earnings lifted the stock.Shares of Mattel (MAT 0.79%), the toymaker known for brands like Barbie and Hot Wheels, were flying higher this week after the company received a buyout offer. According to Reuters, Mattel was approached by a private equity firm.The stock surged on that news on Monday, then pulled back on Tuesday as enthusiasm cooled off before jumping again on Wednesday after it reported better-than-expected second-quarter profits on Tuesday night. ...