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 CSG Systems International (Nasdaq: CSGS) climbed as much as 17% today as the support-services provider smashed earnings estimates and raised its guidance for the year.

So what: CSG beat earnings estimates by 20% or more for the third quarter in a row, earning an adjusted profit of $0.56 per share and bringing in $183.9 million in revenue, also above estimates. Other highlights included repurchasing 345,000 shares at an average cost of $15.76, and raising its full-year guidance to a non-GAAP EPS of $2.00-$2.15. The guidance was also adjusted to include the effects of its $19 million acquisition of the Swedish software company Ascade in July.

Now what: With a relatively low forward P/E of 9.8, and a track record of consistently beating the Street, this stock looks appealing. Analysts have yet to boost their estimates; they will likely do so, and for next year as well -- the 2013 consensus is just $1.99 right now. While revenue is not expected to grow rapidly, CSG's share buyback program should help boost investor returns.

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Fool contributor Jeremy Bowman holds no positions in the companies in this article. The Motley Fool has a disclosure policy. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. Try any of our Foolish newsletter services free for 30 days.