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 Corinthian Colleges (UNKNOWN:COCOQ.DL), a for-profit education company operating under the Everest, WyoTech, and Heald brand names, shed 13% of its value after reporting its fourth-quarter earnings results and providing fiscal 2014 guidance.

So what: For the quarter, Corinthian reported a nearly 3% decline in revenue to $377.5 million as EPS came in at $0.05, $0.01 better than expectations. The train left the tracks when Corinthian issued its upcoming quarter and full-year guidance. For the first-quarter of 2014, it sees student growth of negative 6%-8%, revenue of $372 million to $382 million, and an EPS loss of $0.06-$0.09 when expectations had called for revenue of $393.2 million and a profit of $0.04. The company blamed tough first-quarter comparisons last year as to why its year-over-year online enrollments are expected to fall in the first-quarter. For the full-year, Corinthian is forecasting positive student enrollment and EPS of $0.10-$0.15 as compared to the consensus of $0.23.

Now what: For-profit educators are still under quite a bit of pressure with U.S. regulators closely monitoring how they advertise to, and make loans for, prospective students. Corinthian is clearly struggling under tighter regulations to grow its enrollment, and it also ended 2013 with $26 million less in cash than the previous year. Until there are clear signs enrollment is improving, I'd suggest keeping a safe distance from Corinthian Colleges -- otherwise, you may be sent to detention along with this stock.