Form: SC 13G

Schedule filed to report acquisition of beneficial ownership of 5% or more of a class of equity securities by passive investors and certain institutions

May 3, 2013

Documents

Exhibit 99.1
JOINT FILING AGREEMENT

The undersigned hereby agree 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.
 
Dated: May 3, 2013

S.A.C. CAPITAL ADVISORS, L.P.

By:  /s/ Peter Nussbaum      
Name:  Peter Nussbaum
Title:  Authorized Person

S.A.C. CAPITAL ADVISORS, INC.
 
By:  /s/ Peter Nussbaum      
Name:  Peter Nussbaum
Title:  Authorized Person
 

CR INTRINSIC INVESTORS, LLC

By:  /s/ Peter Nussbaum      
Name:  Peter Nussbaum
Title:  Authorized Person
 

PARAMETER CAPITAL MANAGEMENT, LLC

By:  /s/ Peter Nussbaum      
Name:  Peter Nussbaum
Title:  Authorized Person

STEVEN A. COHEN

By:  /s/ Peter Nussbaum      
Name:  Peter Nussbaum
Title:  Authorized Person