Do I need to send in the 502 DEP payment vouchers if my employer withholds Maryland taxes already? These were included with my 2015 return.

I filed my Maryland 2015 Tax Return and within the return were 502 DEP payment vouchers to be submitted quarterly with a 502 Form. This is stating this is for estimated income tax. However, my employer withholds all of my required income tax. Do I still need to send these in and essentially pay double taxes?