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: October 16, 2015

DUQUESNE FAMILY OFFICE LLC

By: /s/ Gerald Kerner                                   

Name:Gerald Kerner

Title:  Authorized Person

STANLEY F. DRUCKENMILLER

By: /s/ Gerald Kerner                                    

Name:Gerald Kerner

Title:  Attorney-in-Fact