POWER OF ATTORNEY

      Know all by these present, that the undersigned does hereby constitute and
appoint John Gherlein, John Harrington, Matthew Oliver and Samuel Toth, and each
of them, as the undersigned's true and lawful attorneys-in-fact and agents to do
any and all things, and execute any or all instruments which, after the advice
of counsel, said attorneys and agents may deem necessary and advisable to enable
the undersigned to comply with the Securities Exchange Act of 1934, as amended,
and any rules and regulations and requirements of the Securities and Exchange
Commission ("SEC"), including specifically, but without limitation thereof,
power of attorney to sign the undersigned's name to a Form ID, Schedule 13D or
13G and any amendments thereto, or a Form 144, Form 3, Form 4 or Form 5 and any
amendments thereto, to be filed with the SEC; and the undersigned does hereby
ratify and confirm all that any of said attorneys and agents shall do or cause
to be done by virtue hereof.  The undersigned may revoke the authority granted
herein upon delivering a signed written notice to the foregoing attorneys-in-
fact.


      Executed on this 29th day of November, 2018.



      OAK TREE ARCHWAY LLC


      By:  /s/ Christopher M. Essig
           ------------------------
      Name:	Christopher M. Essig
      Title: 	Vice President