Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Shares^F2,F6,F7	Apr 29, 2015	S	48,584	$31.60	D	1,859,103	I	See Footnotes
Common Shares^F2,F8	Apr 29, 2015	S	6,491	$31.60	D	248,388	I	See Footnote
Common Shares^F2,F9,F10	Apr 29, 2015	S	48,220	$31.60	D	1,845,139	I	See Footnotes
Common Shares^F2,F11,F12	Apr 29, 2015	S	121,480	$31.60	D	4,648,458	I	See Footnotes
Common Shares^F2,F13,F14	Apr 29, 2015	S	826,075	$31.60	D	31,609,961	I	See Footnotes
Common Shares	holding	—	—		—	50,051	D
Common Shares^F3	holding	—	—		—	3,228	D
Common Shares^F4	holding	—	—		—	1,335	D
Common Shares^F5	holding	—	—		—	1,520	D

Table II — derivative securities

No Table II lines on this filing.

Explanation of responses

F1In connection with that certain underwriting agreement, dated April 8, 2015 (the "Underwriting Agreement"), by and among Master Account, Capital Partners (100), Institutional Partners II, Institutional Partners IIA and Institutional Partners III (collectively, the "MHR Funds"), the Issuer and J.P. Morgan Securities LLC (the "Underwriter"), on April 24, 2015, the Underwriter exercised its option pursuant to the Underwriting Agreement to purchase an additional 1,050,850 Common Shares owned by the MHR Funds. The sale by the MHR Funds to the Underwriter of such additional 1,050,850 Common Shares closed on April 29, 2015.
F10Accordingly, Institutional Advisors II, MHRC II, Fund Management, MHR Holdings and Dr. Rachesky may be deemed to beneficially own the Common Shares held for the account of Institutional Partners II. Each of Institutional Advisors II, MHRC II, Fund Management, MHR Holdings and Dr. Rachesky disclaims beneficial ownership of such Common Shares except to the extent of their pecuniary interest therein.
F11These Common Shares are held for the account of MHR Institutional Partners IIA LP, a Delaware limited partnership ("Institutional Partners IIA"). Institutional Advisors II is the general partner of Institutional Partners IIA. MHRC II is the managing member of Institutional Advisors II. Dr. Rachesky is the managing member of MHRC II. Fund Management has an investment management agreement with Institutional Partners IIA pursuant to which it has the power to vote or direct the vote and to dispose or to direct the disposition of the Common Shares held for the account of Institutional Partners IIA. MHR Holdings is the managing member of Fund Management. (Continued to footnote 11)
F12Accordingly, Institutional Advisors II, MHRC II, Fund Management, MHR Holdings and Dr. Rachesky may be deemed to beneficially own the Common Shares held for the account of Institutional Partners IIA. Each of Institutional Advisors II, MHRC II, Fund Management, MHR Holdings and Dr. Rachesky disclaims beneficial ownership of such Common Shares except to the extent of their pecuniary interest therein.
F13These Common Shares are held for the account of Institutional Partners III LP, a Delaware limited partnership ("Institutional Partners III"). MHR Institutional Advisors III LLC, a Delaware limited liability company ("Institutional Advisors III"), is the general partner of Institutional Partners III. Dr. Rachesky is the managing member of Institutional Advisors III. Fund Management is an affiliate of, and has an investment management agreement with, Institutional Partners III pursuant to which it has the power to vote or direct the vote and to dispose or to direct the disposition of the Common Shares held for the account of Institutional Partners III. MHR Holdings is the managing member of Fund Management. (Continued to footnote 13)
F14Accordingly, Institutional Advisors III, Fund Management, MHR Holdings and Dr. Rachesky may be deemed to beneficially own the Common Shares held for the account of Institutional Partners III. Each of Institutional Advisors III, Fund Management, MHR Holdings and Dr. Rachesky disclaims beneficial ownership of such Common Shares except to the extent of their pecuniary interest therein.
F2The price represents the public offering price of $32.00 per share, net underwriting discounts of $0.40 per Common Share.
F3These are restricted share units granted by the Issuer, payable upon vesting in an equal number of Common Shares, which are scheduled to vest or have vested in three equal annual installments beginning on September 11, 2013.
F4These are restricted share units granted by the Issuer, payable upon vesting in an equal number of Common Shares, which are scheduled to vest or have vested in three equal annual installments beginning on September 10, 2014.
F5These are restricted share units granted by the Issuer, payable upon vesting in an equal number of Common Shares, which are scheduled to vest in three equal annual installments beginning on September 9, 2015.
F6These Common Shares are held for the account of MHR Capital Partners Master Account LP, an Anguilla, British West Indies limited partnership ("Master Account"). MHR Advisors LLC, a Delaware limited liability company ("Advisors"), is the general partner of Master Account. MHRC LLC, a Delaware limited liability company ("MHRC"), is the managing member of Advisors. Mark H. Rachesky, M.D. ("Dr. Rachesky") is the managing member of MHRC. MHR Fund Management LLC ("Fund Management") has an investment management agreement with Master Account pursuant to which it has the power to vote or direct the vote and to dispose or to direct the disposition of the Common Shares held for the account of Master Account. MHR Holdings LLC, a Delaware limited liability company ("MHR Holdings"), is the managing member of Fund Management. (Continued to footnote 6)
F7Accordingly, Advisors, MHRC, Fund Management, MHR Holdings and Dr. Rachesky may be deemed to beneficially own the Common Shares held for the account of Master Account. Each of Advisors, MHRC, Fund Management, MHR Holdings and Dr. Rachesky disclaims beneficial ownership of such Common Shares except to the extent of their pecuniary interest therein.
F8These Common Shares are held for the account of MHR Capital Partners (100) LP, a Delaware limited partnership ("Capital Partners (100)"). Advisors is the general partner of Capital Partners (100). MHRC is the managing member of Advisors. Dr. Rachesky is the managing member of MHRC. Fund Management has an investment management agreement with Capital Partners (100) pursuant to which it has the power to vote or direct the vote and to dispose or to direct the disposition of the Common Shares held for the account of Capital Partners (100). MHR Holdings is the managing member of Fund Management. Accordingly, Advisors, MHRC, Fund Management, MHR Holdings and Dr. Rachesky may be deemed to beneficially own the Common Shares held for the account of Capital Partners (100). Each of Advisors, MHRC, Fund Management, MHR Holdings and Dr. Rachesky disclaims beneficial ownership of such Common Shares except to the extent of their pecuniary interest therein.
F9These Common Shares are held for the account of MHR Institutional Partners II LP, a Delaware limited partnership ("Institutional Partners II"). MHR Institutional Advisors II LLC, a Delaware limited liability company ("Institutional Advisors II"), is the general partner of Institutional Partners II. MHRC II LLC, a Delaware limited liability company ("MHRC II"), is the managing member of Institutional Advisors II. Dr. Rachesky is the managing member of MHRC II. Fund Management has an investment management agreement with Institutional Partners II pursuant to which it has the power to vote or direct the vote and to dispose or to direct the disposition of the Common Shares held for the account of Institutional Partners II. MHR Holdings is the managing member of Fund Management. (Continued in footnote 9)