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 Lithia Motors (NYSE:LAD), an automotive retailer, fell as much as 11% after reporting its fourth-quarter earnings results.

So what: For the quarter, Lithia reported phenomenal results. Revenue rose 26% to $877.4 million as new vehicle same-store sales spiked 31% and used vehicle same-store sales advanced 20%. Quarterly profit rose 52% to $0.74 from the previous year. Both figures handily surpassed the $0.66 in EPS and $824.9 million Wall Street had been expecting. For 2013, Lithia is forecasting revenue of $3.7 billion to $3.8 billion, and EPS of $3.25 to $3.35. Current consensus estimates pegged Lithia at $3.66 billion in revenue and $3.26 in EPS.

Now what: Mr. Market seems to be unhappy with Lithia's historically conservative guidance, especially after reporting those aforementioned robust same-store sales figures. Keep in mind that Lithia has now crushed estimates by double digits in at least the past five quarters, so being conservative with its guidance isn't necessarily a bad thing. What'll be important for Lithia is if it can translate lower household incomes for consumers resulting from the payroll tax into consistent growth on its end. Based on its recent results, I'd say it's quite possible.

Craving more input? Start by adding Lithia Motors to your free and personalized Watchlist so you can keep up on the latest news with the company.

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.