EXHIBIT 4

JOINT FILING AGREEMENT
PURSUANT TO RULE 13d-1(k)

The undersigned acknowledge and agree that the foregoing statement on Schedule 13D is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13D shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained herein and therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate.

DATE: March 25, 2014

CLINTON SPOTLIGHT MASTER FUND, L.P.

By: Clinton Group, Inc., its investment manager

/s/ Francis Ruchalski

Name: Francis Ruchalski

Title: Chief Financial Officer

CLINTON MAGNOLIA MASTER FUND, LTD.

By: Clinton Group, Inc., its investment manager

/s/ Francis Ruchalski

Name: Francis Ruchalski

Title: Chief Financial Officer

CLINTON RELATIONAL OPPORTUNITY MASTER FUND, L.P.

By: Clinton Relational Opportunity, LLC, its

investment manager

/s/ John Hall

Name: John Hall

Title: Authorized Signatory

CLINTON RELATIONAL OPPORTUNITY, LLC

/s/ John Hall

Name: John Hall

Title: Authorized Signatory

GEH CAPITAL, INC.

/s/ Francis Ruchalski

Name:  Francis Ruchalski

Title:    Comptroller

CLINTON GROUP, INC.

/s/ Francis Ruchalski

Name: Francis Ruchalski

Title: Chief Financial Officer

/s/ George E. Hall

George E. Hall