EXHIBIT 99.1
SIGNATURES OF REPORTING PERSONS
After reasonable inquiry and to the best of our knowledge and belief, the
undersigned certify that the information set forth in this Form 4 is true,
complete and correct.
March 11, 2015
WP EXPEDITION CO-INVEST L.P.
By: Warburg Pincus Partners, L.P., its general partner
By: Warburg Pincus Partners GP LLC, its general partner
By: Warburg Pincus & Co., its managing member
By: /s/ Robert B. Knauss
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Robert B. Knauss
Partner
WARBURG PINCUS PARTNERS, L.P.
By: Warburg Pincus Partners GP LLC, its general partner
By: Warburg Pincus & Co., its managing member
By: /s/ Robert B. Knauss
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Robert B. Knauss
Partner
WARBURG PINCUS PARTNERS GP LLC
By: Warburg Pincus & Co., its managing member
By: /s/ Robert B. Knauss
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Robert B. Knauss
Partner
WARBURG PINCUS & CO.
By: /s/ Robert B. Knauss
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Robert B. Knauss
Partner
CHARLES R. KAYE
By: /s/ Robert B. Knauss
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Robert B. Knauss, Attorney-in-Fact*
JOSEPH P. LANDY
By: /s/ Robert B. Knauss
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Robert B. Knauss, Attorney-in-Fact*
*The Power of Attorney given by each of Mr. Kaye and Mr. Landy was previously
filed with the U.S. Securities & Exchange Commission on November 26, 2013 as an
exhibit to a statement on Form 4 filed by Warburg Pincus Private Equity IX, L.P.
with respect to Laredo Petroleum Holdings, Inc. (now known as Laredo Petroleum,
Inc.) and is hereby incorporated by reference.
