JOINT FILING AGREEMENT

The undersigned hereby agrees that the foregoing statement on Schedule 13G is
filed on behalf of each of the undersigned in accordance with the provisions of
Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, and that
all subsequent amendments to this statement on Schedule 13G may be filed on
behalf of each of the undersigned without the necessity of filing additional
joint filing agreements.

July 10, 2009