JOINT FILING AGREEMENT

EXHIBIT 1

JOINT FILING AGREEMENT

Pursuant to Rule 13(d)-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, each of the undersigned acknowledges and agrees that the foregoing statement on Schedule 13D is filed on behalf of the undersigned and that all subsequent amendments to this statement on Schedule 13D shall be filed on behalf of the undersigned without the necessity of filing additional joint acquisition statements.  Each of the undersigned acknowledges that it shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning it contained therein, but shall not be responsible for the completeness and accuracy of the information concerning the other, except to the extent that he or it knows or has reason to believe that such information is inaccurate.

Dated as of October 31, 2013.

	OCM GW HOLDINGS, LLC
	By:	OCM Principal Opportunities Fund III, L.P.
	Its:	Managing Member
	By:	OCM Principal Opportunities Fund III GP, L.P.
	Its:	General Partner
	By:	Oaktree Fund GP I, L.P.
	Its:	General Partner
	By:	/s/ Xxxx Xxxx
	Name:	Xxxx Xxxx
	Title:	Authorized Signatory
	By:	/s/ Xxxxxx Xxxxxxxxx
	Name:	Xxxxxx Xxxxxxxxx
	Title:	Authorized Signatory

	OCM PRINCIPAL OPPORTUNITIES FUND III, L.P.
	By:	OCM Principal Opportunities Fund III GP, L.P.
	Its:	General Partner
	By:	Oaktree Fund GP I, L.P.
	Its:	General Partner
	By:	/s/ Xxxx Xxxx
	Name:	Xxxx Xxxx
	Title:	Authorized Signatory
	By:	/s/ Xxxxxx Xxxxxxxxx
	Name:	Xxxxxx Xxxxxxxxx
	Title:	Authorized Signatory
	OCM PRINCIPAL OPPORTUNITIES FUND III GP, L.P.
	By:	Oaktree Fund GP I, L.P.
	Its:	General Partner
	By:	/s/ Xxxx Xxxx
	Name:	Xxxx Xxxx
	Title:	Authorized Signatory
	By:	/s/ Xxxxxx Xxxxxxxxx
	Name:	Xxxxxx Xxxxxxxxx
	Title:	Authorized Signatory

2

	OAKTREE FUND GP I, L.P.
	By:	/s/ Xxxx Xxxx
	Name:	Xxxx Xxxx
	Title:	Authorized Signatory
	By:	/s/ Xxxxxx Xxxxxxxxx
	Name:	Xxxxxx Xxxxxxxxx
	Title:	Authorized Signatory
	OAKTREE CAPITAL I, L.P.
	By:	OCM Holdings I, LLC
	Its:	General Partner
	By:	/s/ Xxxx Xxxx
	Name:	Xxxx Xxxx
	Title:	Managing Director, General Counsel and Secretary
	By:	/s/ Xxxxxx Xxxxxxxxx
	Name:	Xxxxxx Xxxxxxxxx
	Title:	Senior Vice President
	OCM HOLDINGS I, LLC
	By:	/s/ Xxxx Xxxx
	Name:	Xxxx Xxxx
	Title:	Managing Director, General Counsel and Secretary
	By:	/s/ Xxxxxx Xxxxxxxxx
	Name:	Xxxxxx Xxxxxxxxx
	Title:	Senior Vice President

3

	OAKTREE HOLDINGS, LLC
	By:	Oaktree Capital Group, LLC
	Its:	Managing Member
	By:	/s/ Xxxx Xxxx
	Name:	Xxxx Xxxx
	Title:	Managing Director, General Counsel and Secretary
	By:	/s/ Xxxxxx Xxxxxxxxx
	Name:	Xxxxxx Xxxxxxxxx
	Title:	Senior Vice President
	OAKTREE CAPITAL GROUP, LLC
	By:	/s/ Xxxx Xxxx
	Name:	Xxxx Xxxx
	Title:	Managing Director, General Counsel and Secretary
	By:	/s/ Xxxxxx Xxxxxxxxx
	Name:	Xxxxxx Xxxxxxxxx
	Title:	Senior Vice President
	OAKTREE CAPITAL GROUP HOLDINGS GP, LLC
	By:	/s/ Xxxx Xxxx
	Name:	Xxxx Xxxx
	Title:	Managing Director, General Counsel and Secretary
	By:	/s/ Xxxxxx Xxxxxxxxx
	Name:	Xxxxxx Xxxxxxxxx
	Title:	Senior Vice President

4

	OCM CRIMSON HOLDINGS, LLC
	By:	OCM Principal Opportunities Fund IV, L.P.
	Its:	Managing Member
	By:	OCM Principal Opportunities Fund IV GP, L.P.
	Its:	General Partner
	By:	OCM Principal Opportunities Fund IV GP Ltd.
	Its:	General Partner
	By:	Oaktree Capital Management, L.P.
	Its:	Director
	By:	/s/ Xxxx Xxxx
	Name:	Xxxx Xxxx
	Title:	Managing Director
	By:	/s/ Xxxxxx Xxxxxxxxx
	Name:	Xxxxxx Xxxxxxxxx
	Title:	Senior Vice President
	OCM PRINCIPAL OPPORTUNITIES FUND IV, L.P.
	By:	OCM Principal Opportunities Fund IV GP, L.P.
	Its:	General Partner
	By:	OCM Principal Opportunities Fund IV GP Ltd.
	Its:	General Partner
	By:	Oaktree Capital Management, L.P.
	Its:	Director
	By:	/s/ Xxxx Xxxx
	Name:	Xxxx Xxxx
	Title:	Managing Director
	By:	/s/ Xxxxxx Xxxxxxxxx
	Name:	Xxxxxx Xxxxxxxxx
	Title:	Senior Vice President

5

	OCM PRINCIPAL OPPORTUNITIES FUND IV GP, L.P.
	By:	OCM Principal Opportunities Fund IV GP Ltd.
	Its:	General Partner
	By:	Oaktree Capital Management, L.P.
	Its:	Director
	By:	/s/ Xxxx Xxxx
	Name:	Xxxx Xxxx
	Title:	Managing Director
	By:	/s/ Xxxxxx Xxxxxxxxx
	Name:	Xxxxxx Xxxxxxxxx
	Title:	Senior Vice President
	OCM PRINCIPAL OPPORTUNITIES FUND IV GP LTD.
	By:	Oaktree Capital Management, L.P.
	Its:	Director
	By:	/s/ Xxxx Xxxx
	Name:	Xxxx Xxxx
	Title:	Managing Director
	By:	/s/ Xxxxxx Xxxxxxxxx
	Name:	Xxxxxx Xxxxxxxxx
	Title:	Senior Vice President
	OAKTREE CAPITAL MANAGEMENT, L.P.
	By:	/s/ Xxxx Xxxx
	Name:	Xxxx Xxxx
	Title:	Managing Director
	By:	/s/ Xxxxxx Xxxxxxxxx
	Name:	Xxxxxx Xxxxxxxxx
	Title:	Senior Vice President

6

	OAKTREE HOLDINGS, INC.
	By:	/s/ Xxxx Xxxx
	Name:	Xxxx Xxxx
	Title:	Managing Director, General Counsel and Secretary
	By:	/s/ Xxxxxx Xxxxxxxxx
	Name:	Xxxxxx Xxxxxxxxx
	Title:	Senior Vice President

7