POWER OF ATTORNEY
The undersigned constitutes and appoints Robert W. Lloyd and R. Andrew Watts, or
either of them, as his true and lawful attorney-in-fact and agent, with full
power of substitution and resubstitution, for him and in his name, place and
stead, in any and all capacities, to sign all reports (including Forms 4 and
Forms 5) required to be filed by the undersigned pursuant to Section 16 of the
Securities Exchange Act and the rules and regulations promulgated thereunder,
and to file the same, with all exhibits thereto, and other documents in
connection therewith, with the Securities and Exchange commission, granting unto
said attorneys-in-fact and agents full power and authority to do and perform
each and every act and thing requisite and necessary to be done in and about the
premises as fully to all intents and purposes as he might or could in person,
hereby ratifying and confirming all that said attorneys-in-fact and agents, or
their substitutes, may lawfully do or cause to be done by virtue hereof.


/s/ Chilton D. Varner
Jan. 20, 2016