EXHIBIT A

POWER OF ATTORNEY

The undersigned, being each of the executive officers and members
of the Management Committee of PRIVATE CAPITAL MANAGEMENT, L.P.,
a limited partnership duly organized under the laws of the State
of Delaware (the "Company"), do hereby make, constitute and appoint
each of Chad D. Atkins and David G. Joyce acting severally, as the
Company's true and lawful attorney-in-fact, for the purpose of, from
time to time, executing in its name and on its behalf, whether the
Company is acting individually or as representative of others, any
and all documents, certificates, instruments, statements, other
filings and amendments to the foregoing (collectively, "documents")
determined by such person to be necessary or appropriate to comply
with ownership or control-person reporting requirements imposed by
any United States or non-United States governmental or regulatory
authority, including without limitation Forms 13D, 13F and 13G and
any amendments to any of the foregoing as may be required to be filed
with the Securities and Exchange Commission; delivering, furnishing
or filing any such documents with the appropriate governmental,
regulatory authority or other person; and giving and granting to each
such attorney-in-fact power and authority to act in such premises as
fully and to all intents and purposes as the Company might or could
do if personally present by one or more of its authorized signatories.
The Company further hereby ratifies and confirms all that said
attorney-in-fact shall lawfully do or cause to be done by virtue hereof.

Any such determination by an attorney-in-fact named herein shall be
conclusively evidenced by such person's execution, delivery, furnishing
or filing of the applicable document.

This power of attorney shall be valid from the date hereof and remain
in full force and effect until either revoked in writing by the
Company, or, in respect of any attorney-in-fact named herein, until
such person ceases to serve as an officer of the Company.

IN WITNESS WHEREOF, the undersigned has caused this power of attorney
to be executed as of this 3rd day of January, 2007.

PRIVATE CAPITAL MANAGEMENT, L.P.

By: /s/ Bruce S. Sherman
Name: Bruce S. Sherman
Title: CEO

By: /s/ Gregg J. Powers
Name: Gregg J. Powers
Title: President