EXHIBIT 2

CUSIP No. 80007P307

AGREEMENT CONCERNING JOINT FILING

OF SCHEDULE 13G/A

The undersigned agree as follows:

(i) each of them is individually eligible to use the Schedule 13G/A to which this Exhibit is attached, and such Schedule 13G/A is filed on behalf of each of them; and

(ii) each of them is responsible for the timely filing of such Schedule 13G/A and any amendments thereto, and for the completeness and accuracy of the information concerning such person contained therein; but none of them is responsible for the completeness or accuracy of the information concerning the other person making the filing, unless such person knows or has reason to believe that such information is inaccurate.

This Agreement may be executed in any number of counterparts, each of which shall be deemed to be an original, but all of which, taken together, shall constitute one and the same instrument.

Dated: February 12, 2016

V. PREM WATSA
/s/ V. Prem Watsa
1109519 ONTARIO LIMITED
By:	/s/ V. Prem Watsa
	Name: V. Prem Watsa
	Title:   President
THE SIXTY TWO INVESTMENT COMPANY LIMITED
By:	/s/ V. Prem Watsa
	Name: V. Prem Watsa
	Title:   President
810679 ONTARIO LIMITED
By:	/s/ V. Prem Watsa
	Name: V. Prem Watsa
	Title:   President

FAIRFAX FINANCIAL HOLDINGS LIMITED
By:	/s/ Paul Rivett
	Name: Paul Rivett
	Title:   President
FFHL GROUP LTD.
By:	/s/ Paul Rivett
	Name: Paul Rivett
	Title:   Director

FAIRFAX (US) INC.
By:	/s/ Dorothy D. Whitaker
	Name: Dorothy D. Whitaker
	Title:   Vice President, Treasurer, Secretary and Director
TIG HOLDINGS, INC.
By:	/s/ Dorothy D. Whitaker
	Name: Dorothy D. Whitaker
	Title:   Chairman, President, Secretary and Director

ODYSSEY US HOLDINGS INC.
By:	/s/ Jan Christiansen
	Name: Jan Christiansen
	Title:   Executive Vice President
ODYSSEY RE HOLDINGS CORP.
By:	/s/ Jan Christiansen
	Name: Jan Christiansen
	Title:   Executive Vice President

ODYSSEY REINSURANCE COMPANY
By:	/s/ Kirk M. Reische
	Name: Kirk M. Reische
	Title:   Vice President
HUDSON INSURANCE COMPANY
By:	/s/ Kirk M. Reische
	Name: Kirk M. Reische
	Title:   Vice President
HUDSON SPECIALTY INSURANCE COMPANY
By:	/s/ Kirk M. Reische
	Name: Kirk M. Reische
	Title:   Vice President

NEWLINE HOLDINGS UK LIMITED
By:	/s/ J. Richard F. Micklem
	Name: J. Richard F. Micklem
	Title:   Director and Company Secretary
NEWLINE INSURANCE COMPANY LIMITED
By:	/s/ J. Richard F. Micklem
	Name: J. Richard F. Micklem
	Title:   Director and Company Secretary
NEWLINE CORPORATE NAME LIMITED
By:	/s/ J. Richard F. Micklem
	Name: J. Richard F. Micklem
	Title:   Director and Company Secretary

TIG INSURANCE COMPANY
By:	/s/ John J. Bator
	Name: John J. Bator
	Title:   Senior Vice President and Director
CLEARWATER INSURANCE COMPANY
By:	/s/ John J. Bator
	Name: John J. Bator
	Title:   Senior Vice President and Director
RIVERSTONE HOLDINGS LIMITED
By:	/s/ John J. Bator
	Name: John J. Bator
	Title:   Director
RIVERSTONE INSURANCE LIMITED
By:	/s/ John J. Bator
	Name: John J. Bator
	Title:   Director

ZENITH NATIONAL INSURANCE CORP.
By:	/s/ Michael Jansen
	Name:	Michael Jansen
	Title:	Executive Vice President, General Counsel and Director
ZENITH INSURANCE COMPANY
By:	/s/ Michael Jansen
	Name:	Michael Jansen
	Title:	Executive Vice President, General Counsel and Director

CRUM & FORSTER HOLDINGS CORP.
By:	/s/ Paul W. Bassaline
	Name:	Paul W. Bassaline
	Title:	Senior Vice President, Chief Financial Officer, and Director
UNITED STATES FIRE INSURANCE COMPANY
By:	/s/ Paul W. Bassaline
	Name:	Paul W. Bassaline
	Title:	Senior Vice President, Chief Financial Officer, and Director
THE NORTH RIVER INSURANCE COMPANY
By:	/s/ Paul W. Bassaline
	Name:	Paul W. Bassaline
	Title:	Senior Vice President, Chief Financial Officer, and Director
FIRST MERCURY FINANCIAL CORPORATION
By:	/s/ Paul W. Bassaline
	Name:	Paul W. Bassaline
	Title:	Vice President
FIRST MERCURY INSURANCE COMPANY
By:	/s/ Paul W. Bassaline
	Name:	Paul W. Bassaline
	Title:	Senior Vice President and Chief Financial Officer

FAIRFAX (BARBADOS) INTERNATIONAL CORP.
By:	/s/ Ronald Schokking
	Name: Ronald Schokking
	Title:   Chairman

FAIRFAX ASIA LIMITED
By:	/s/ Janice Burke
	Name: Janice Burke
	Title:   Vice President and General Manager

FIRST CAPITAL INSURANCE LIMITED
By:	/s/ Ramaswamy Athappan
	Name: Ramaswamy Athappan
	Title:   Chief Executive Officer

FALCON INSURANCE COMPANY (HONG KONG) LTD.
By:	/s/ Gobinath Arvind Athappan
	Name: Gobinath Arvind Athappan
	Title:   Deputy Chairman

ADVENT CAPITAL (HOLDINGS) LTD.
By:	/s/ Neil Ewing
	Name: Neil Ewing
	Title:   Company Secretary

NORTHBRIDGE FINANCIAL CORPORATION
By:	/s/ Craig Pinnock
	Name: Craig Pinnock
	Title:   Chief Financial Officer
NORTHBRIDGE GENERAL INSURANCE CORPORATION
By:	/s/ Craig Pinnock
	Name: Craig Pinnock
	Title:   Chief Financial Officer and Director