Kohl's shares tumbled Tuesday morning despite releasing fiscal second-quarter earnings that beat analysts' profit and sales estimates. The retailer raised its profit outlook for the year, but it wasn't enough to please investors. Ahead of Tuesday's losses, Kohl's stock had climbed more than 110 percent from a year ago, bringing the retailer's market cap to roughly $13.2 billion. Retail rival Macy's saw a similar sell-off in its shares last week on the heels of a strong earnings report.