Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of oil and gas explorer QEP Resources, Inc. (NYSE:QEP) fell as much as 19% today after the company reported earnings.

So what: Fourth-quarter revenue was up 1.5% to $715.5 million, but fell well short of the $767.8 million analysts expected. On the bottom line, the company lost $52 million and after pulling out one-time charges, earnings were $0.17 per share, less than half of the $0.40 per share Wall Street expected.  

Now what: Cold weather affected some operations and equivalent production fell 10% last quarter to 75.1 Bcfe, a big reason for the weakness in earnings. What's also concerning is that management doesn't expect growth this year, forecasting 283-307 Bcfe of production this year. With operations not growing at a significant clip, I don't see shares being worth 25 times trailing earnings, especially when you consider that the last four quarters have failed to miss expectations.

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.