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 marine transport provider Hornbeck Offshore Services (NYSE:HOS) jumped 13% today after the company released earnings.

So what: Revenue jumped 23% from a year ago, to $147.5 million, and adjusted earnings per share jumped from $0.17, to $0.59 per share. Wall Street only expected $136.6 million in revenue, and earnings of $0.30 per share, so results shocked investors. 

Now what: Both upstream and downstream revenue were up significantly over a year ago, and operating margins were up as a result. A big jump in utilization of offshore supply vessels drove revenue growth, and because the company's largest expense is capital expenditures, increased revenues provides leverage to the bottom line. I think strong demand will continue as offshore drilling picks up in the Gulf of Mexico, and that will continue to push the stock higher.

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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.