Exhibit 1
AGREEMENT AS TO JOINT FILING OF AMENDMENT NO. 1 TO SCHEDULE 13D
Dated February 4, 2011
The undersigned acknowledge and agree that the foregoing statement on Amendment No. 1 to Schedule 13D is filed on behalf of each of the undersigned.
This Agreement may be executed in counterparts and each of such counterparts taken together shall constitute one and the same instrument.
BLUE HARBOUR GROUP, LP
By: Blue Harbour Holdings, LLC, its general partner
By: /s/ Clifton S. Robbins
Name: Clifton S. Robbins
Title: Managing Member
BLUE HARBOUR STRATEGIC VALUE
PARTNERS MASTER FUND, LP
By: Blue Harbour GP, LLC, its general partner
By: /s/ Clifton S. Robbins
Name: Clifton S. Robbins
Title: Managing Member
BLUE HARBOUR INSTITUTIONAL PARTNERS MASTER FUND, L.P.
By: Blue Harbour GP, LLC, its general partner
By: /s/ Clifton S. Robbins
Name: Clifton S. Robbins
Title: Managing Member
BLUE HARBOUR GP, LLC
By: /s/ Clifton S. Robbins
Name: Clifton S. Robbins
Title: Managing Member
BLUE HARBOUR HOLDINGS, LLC
By: /s/ Clifton S. Robbins
Name: Clifton S. Robbins
Title: Managing Member
/s/ Clifton S. Robbins
Clifton S. Robbins