I am sorry to read this! I went through this same event except with rocks, I made a thread about it in 2008 here:
Have To Vent...Disrespectful Kids Today..Throwing Rocks At Cars! My CAR!! :(
The kids were charged and I was paid $1800 in retribution for damages to my car based on a quote I provided to the courts , every month I would get a check for $250-$300 until it was paid in full.
Yasin