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 gaming and lottery services specialist Scientific Games Corp. (LNW 0.83%) plummeted 18% today after its quarterly results and outlook disappointed Wall Street.

So what: The stock has pulled back sharply over the past six months on signs of deteriorating fundamentals, and today's Q1 results -- net loss of $45 million on revenue of $388 million -- only reinforce that trend. While Scientific's top line was bolstered by its recent acquisition of WMS, a mere 7% sales increase in its lottery business suggests that its organic growth trajectory is flattening much faster than expected.

Now what: Looking ahead, management said it remains on track to achieve at least $60 million of cost savings on an annualized run-rate basis by the end of 2014. "Although we are seeing challenging gaming industry conditions that have negatively affected our gaming product sales results, we believe that Scientific Games is relatively well positioned due to the diversity of revenue streams in our lottery and gaming businesses and the opportunities created by our integration efforts," said CEO David Kennedy. Given those industry headwinds and Scientific's still-massive debt load, however, I'd hold out for a much wider margin of safety before betting on it.