Foreach loop... get managedby for a list of distribution groups

Question

hello all. thanks for the time. this is probably a simple one. but for some reason i can't get this working.  I am trying to get the managedby property of a distribution list.  i can easily get that for one but i want to call a list of distros
from a text file.
for one group:
Get-DistributionGroup groupname | select displayname -expandproperty managedby | select displayname,name
for a list.. I am doing this but it is looping:
get-content c:\output\lists.txt | foreach {get-distributiongroup | select displayname -expandproperty managedby | select displayname,name} | export-csv c:\output\managedby.csv
what am i doing wrong? or is there an easier path... all help is appreciated.  thank you.

Answer 1

thanks that did make a difference but i changed it up a bit. otherwise it puts in a format of where the user account is located in distinguishedname format... below is my change and result.  
the result is now:
[PS] C:\Windows\system32>Get-Content c:\output\test.txt |%{Get-DistributionGroup $_ |select displayname -expandproperty managedby|select displayname,name}
DisplayName                                                 Name
Tech-Engineering                               Smith, Joe
Tech-Networking                                Smith, Jane
Thank you!!