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 Thor Industries (NYSE: THO) fell as much as 13% intraday today after the company reported fiscal-first-quarter results.

So what: Thor, a maker of RVs and buses, reported mixed results, showing growth in its RV business but a revenue decline in the bus segment, for a 21% revenue increase overall. The reason for the decline arises from retailers discounting their RVs and eating into Thor's gross margins. It subsequently missed earnings per share estimates by $0.10, reporting $0.44 when analysts had expected $0.54.

Now what: Thor Industries appears to me to be heavily reliant on the strength of the economy. It recently purchased Heartland RV and looks ready to throw most of its cash flow into building up its RV business. The growth is there; my concern is whether it'll be able to control its own pricing destiny or if retailers will pressure it into discounts like we saw this quarter. Despite the miss, this is a cash-rich, no-debt company with revenue growth in the high single to low double digits, and it bears some watching.

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