Hey Mark, first off not sure if you realized but you quoted form Q4 2018. The latest quarter was Q1 2019 that was under the Q4 2018 report (for comparison).
But to your question, pretty much everyone of these companies give guidance that they are comfortable beating which gives them some wiggle room if something unforeseen happens and/or a nice beat if something doesn’t. To get a better idea, you could go to Q4 2018 press release and look at the guidance to compare.
Chris.