Exhibit 7.1

JOINT FILING AGREEMENT

Pursuant to Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned agree that the Statement on Schedule 13D to which this exhibit is attached is filed on behalf of each of them.

Date: July 8, 2013

AC ACQUISITION I, LLC
By: Ripplewood Partners II, L.P., as its sole member
By: Ripplewood Partners II G.P., L.P., as its general partner
By: RP II GP, LLC, as its general partner
By:	/s/ Christopher P. Minnetian
Name:	Christopher P. Minnetian
Title:	Secretary
RIPPLEWOOD PARTNERS II, L.P.
By: Ripplewood Partners II G.P., L.P., as its general partner
By: RP II GP, LLC, as its general partner
By:	/s/ Christopher P. Minnetian
Name:	Christopher P. Minnetian
Title:	Secretary
AC ACQUISITION II, LLC
By: Ripplewood Partners II Parallel Fund, L.P., as its managing member
By: Ripplewood Partners II G.P., L.P., as its general partner,
By: RP II GP, LLC, as its general partner
By:	/s/ Christopher P. Minnetian
Name:	Christopher P. Minnetian
Title:	Secretary

RIPPLEWOOD PARTNERS II PARALLEL FUND, L.P.
By: Ripplewood Partners II G.P., L.P., as its general partner,
By: RP II GP, LLC, as its general partner
By:	/s/ Christopher P. Minnetian
Name:	Christopher P. Minnetian
Title:	Secretary
RIPPLEWOOD PARTNERS II G.P., L.P.
By: RP II GP, LLC, as its general partner
By:	/s/ Christopher P. Minnetian
Name:	Christopher P. Minnetian
Title:	Secretary
RP II GP, LLC
By:	/s/ Christopher P. Minnetian
Name:	Christopher P. Minnetian
Title:	Secretary
COLLINS FAMILY PARTNERS, L.P.
By: Collins Family Partners, Inc., as its general partner
By:	/s/ Christopher P. Minnetian
Name:	Christopher P. Minnetian
Title:	Secretary
COLLINS FAMILY PARTNERS, INC.
By:	/s/ Christopher P. Minnetian
Name:	Christopher P. Minnetian
Title:	Secretary
TIMOTHY C. COLLINS
*
Timothy C. Collins

* By:	/s/ Christopher P. Minnetian
	Christopher P. Minnetian
	As Attorney-in-Fact