EXHIBIT A AGREEMENT TO FILE JOINT ACQUISITION STATEMENTS AGREEMENT made this 7th day of AUGUST, 2009 by and between DELAWARE GROUP EQUITY FUNDS I, DELAWARE GROUP EQUITY FUNDS II, DELAWARE GROUP EQUITY FUNDS III, DELAWARE GROUP EQUITY FUNDS IV,...Agreement to File Joint Acquisition Statements • August 7th, 2009 • Delaware Management Holdings Co Inc • Investment advice
