American Tower Corp. (AMT, Financial) is known as a good stock for long-term holding. Legendary value investor Chuck Akre (Trades, Portfolio)'s firm has owned this stock for more than 15 years in his fund portfolio. Currently, Akre Capital Management holds nearly 6.20 million shares of the company, representing nearly 8.60% of its equity portfolio. But the stock has done badly in the last three years, down 30.40%, making shareholders disappointed. Let's take a closer look to determine whether American Tower ...