Exhibit 99.1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with each of the Reporting Persons (as such term is defined in the Schedule 13D referred to below) on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the Common Stock, $0.10 par value, of Clayton Williams Energy, Inc., a Delaware corporation, and that this agreement may be included as an exhibit to such joint filing.

IN WITNESS WHEREOF, the undersigned hereby execute this agreement as of March 24, 2016.

AF IV ENERGY AIV B1, L.P.
		/s/ Michael D. Weiner
		By: Michael D. Weiner
		Its: Authorized Signatory
AF IV (U), L.P.
	By:	ARES MANAGEMENT LLC
	Its:	Manager
		/s/ Michael D. Weiner
		By: Michael D. Weiner
		Its: Authorized Signatory
ARES MANAGEMENT LLC
	/s/ Michael D. Weiner
	By: Michael D. Weiner
	Its: Authorized Signatory
ARES MANAGEMENT HOLDINGS L.P.
	By:	ARES HOLDCO LLC
	Its:	General Partner
		/s/ Michael D. Weiner
		By: Michael D. Weiner
		Its: Authorized Signatory
ARES HOLDCO LLC
	/s/ Michael D. Weiner
	By: Michael D. Weiner
	Its: Authorized Signatory

ARES HOLDINGS INC.
	/s/ Michael D. Weiner
	By: Michael D. Weiner
	Its: Authorized Signatory
ARES MANAGEMENT, L.P.
	By:	ARES MANAGEMENT GP LLC
	Its:	General Partner
		/s/ Michael D. Weiner
		By: Michael D. Weiner
		Its: Authorized Signatory
ARES MANAGEMENT GP LLC
	/s/ Michael D. Weiner
	By: Michael D. Weiner
	Its: Authorized Signatory
ARES PARTNERS HOLDCO LLC
	/s/ Michael D. Weiner
	By: Michael D. Weiner
	Its: Authorized Signatory