There was a lot of pent up "sell demand" for the folks who bought in at the previous high back in Oct 2009 time frame. They got back to break even so to speak and are bailing. My guess.
This is definitely an oversold situation. It should bounce a little next week.
Definitely expect dips/spikes all year long. This will be a bit of a rollercoaster ride for the year.
The stock should still trend up to $7+ range by end of the year presuming that the turnaround continues.
Keep in mind that Operating Profit has DOUBLED 2010 over 2009. If they keep paying down that debt load and continue seeing some modest same store performance increases, they will be just fine longer term.
Projections: $7+ by Dec 2010 $7-$11 throughout 2011 $10-$18 throughout 2012