EXHIBIT A

                          AGREEMENT TO FILE JOINT
                          ACQUISITION STATEMENTS

     AGREEMENT made this 6th day of FEBRUARY, 2009 by and
between DELAWARE GROUP EQUITY FUNDS I, DELAWARE GROUP EQUITY FUNDS II,
DELAWARE GROUP EQUITY FUNDS III, DELAWARE GROUP EQUITY FUNDS IV, DELAWARE
GROUP EQUITY FUNDS V, DELAWARE GROUP INCOME FUNDS, DELAWARE GROUP
LIMITED-TERM GOVERNMENT FUNDS, DELAWARE GROUP CASH RESERVE, DELAWARE
GROUP GOVERNMENT FUND, DELAWARE GROUP STATE TAX-FREE INCOME TRUST,
DELAWARE GROUP TAX-FREE FUND, DELAWARE GROUP GLOBAL & INTERNATIONAL
FUNDS, DELAWARE GROUP TAX-FREE MONEY FUND, DELAWARE GROUP ADVISER FUNDS,
DELAWARE VIP TRUST, DELAWARE POOLED TRUST, DELAWARE GROUP FOUNDATION FUNDS,
DELAWARE INVESTMENTS DIVIDEND AND INCOME FUND, INC., DELAWARE INVESTMENTS
GLOBAL DIVIDEND AND INCOME FUND, INC., DELAWARE ENHANCED GLOBAL DIVIDEND
AND INCOME FUND, VOYAGEUR INSURED FUNDS, VOYAGEUR INTERMEDIATE TAX
FREE FUNDS, VOYAGEUR MUTUAL FUNDS, VOYAGEUR MUTUAL FUNDS II,
VOYAGEUR MUTUAL FUNDS III, VOYAGEUR TAX FREE FUNDS, DELAWARE INVESTMENTS
ARIZONA MUNICIPAL INCOME FUND, INC., DELAWARE INVESTMENTS COLORADO
MUNICIPAL INCOME FUND, INC.DELAWARE INVESTMENTS NATIONAL MUNICIPAL
INCOME FUND, DELAWARE INVESTMENTS MINNESOTA MUNICIPAL INCOME FUND II,INC.,
(the "Delaware Investments Family of Funds"), Delaware Management
Business Trust, and Delaware Management Holdings, Inc., herein collectively
referred to as the "parties".

     WHEREAS, the parties hereto may be deemed to be the direct
or indirect beneficial owners of the same equity securities for
the purpose of the reporting requirements of Section 13(d) of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and

     WHEREAS, the regulations promulgated under Section 13(d) of
the Exchange Act permit the joining of such beneficial owners in the filing of a
single Joint Acquisition Statement reporting such ownership to
the Securities and Exchange Commission.

     NOW, THEREFORE, in consideration of the mutual covenants
herein contained, and each of the parties hereto intending to be
legally bound, it is agreed as follows:

     1.   In the event that any two or more parties shall be
deemed to be the direct or indirect beneficial owners of the same
equity security required to be reported to the Securities and
Exchange Commission such parties may join together in the filing
of a Joint Acquisition Statement with respect to that security.

     2.   With respect to each Joint Acquisition Statement in
which a party joins, each party acknowledges that (a) it will be
eligible under applicable regulations of the Securities and
Exchange Commission to join in the filing and (b) it will be
responsible for the timely filing of such statement and any
amendments thereto and the completeness and accuracy of the
information concerning such party; but each such party shall not
be responsible for the completeness and accuracy of the information
concerning the other parties making the filing, unless such party
knows or has reason to believe that such information with respect
to such other parties is inaccurate.

     3.   The parties consent to the inclusion of a copy of this
agreement as an exhibit to any Joint Acquisition Statement filed
on behalf of any of them.


     IN WITNESS WHEREOF, the parties hereto have executed this
agreement by their duly authorized officers as of the date set
forth above.


                                   DELAWARE GROUP EQUITY FUNDS I
                                   DELAWARE GROUP EQUITY FUNDS II
                                   DELAWARE GROUP EQUITY FUNDS III
                                   DELAWARE GROUP EQUITY FUNDS IV
                                   DELAWARE GROUP EQUITY FUNDS V
                                   DELAWARE GROUP INCOME FUNDS
                                   DELAWARE GROUP LIMITED-TERM
                                    GOVERNMENT FUNDS
                                   DELAWARE GROUP CASH RESERVE
                                   DELAWARE GROUP GOVERNMENT FUND
		     		   DELAWARE GROUP STATE TAX-FREE INCOME
                                    TRUST
                                   DELAWARE GROUP TAX-FREE FUND
                                   DELAWARE GROUP GLOBAL & INTERNATIONAL
                                    FUNDS
                                   DELAWARE GROUP TAX-FREE MONEY FUND
                                   DELAWARE GROUP ADVISER FUNDS
                                   DELAWARE VIP TRUST
                                   DELAWARE POOLED TRUST
                                   DELAWARE GROUP FOUNDATION FUNDS
                                   DELAWARE INVESTMENTS DIVIDEND AND INCOME
                                    FUND, INC.
                                   DELAWARE INVESTMENTS GLOBAL DIVIDEND AND
                                    INCOME FUND, INC.
				   DELAWARE ENHANCED GLOBAL DIVIDEND AND INCOME
				    FUND
                                   VOYAGEUR INSURED FUNDS
                                   VOYAGEUR INTERMEDIATE TAX FREE FUNDS
                                   VOYAGEUR MUTUAL FUNDS
                                   VOYAGEUR MUTUAL FUNDS II
                                   VOYAGEUR MUTUAL FUNDS III
                                   VOYAGEUR TAX FREE FUNDS
                                   DELAWARE INVESTMENTS ARIZONA MUNICIPAL
				   INCOME FUND, INC.
                                   DELAWARE INVESTMENTS COLORADO
				    MUNICIPAL INCOME FUND, INC.
				   DELAWARE INVESTMENTS NATIONAL MUNICIPAL
				    INCOME FUND
                                   DELAWARE INVESTMENTS MINNESOTA MUNICIPAL
				    INCOME FUND II, INC.

ATTEST
/s/ David P. O'Connor                By:  /s/ Brian L. Murray

                                    DELAWARE MANAGEMENT HOLDINGS, INC.
ATTEST
/s/ David P. O'Connor                By: /s/ Brian L. Murray

ATTEST                    DELAWARE MANAGEMENT BUSINESS TRUST

/s/ David P. O'Connor                By: /s/ Brian L. Murray