NEW YORK (TheStreet) -- Peabody Energy released its quarterly results this week, managing to beat analysts' earnings estimate and painting a rosy outlook for the long term. But investors might still want to steer clear of this stock. This is because Peabody Energy, the world's largest coal producer in the private sector, might continue to struggle as the current weakness in coal prices, currently at six-year lows, is expected to persist throughout the next couple of years.