Exhibit 99.2

POWER OF ATTORNEY

        KNOW ALL MEN BY THESE PRESENTS THAT the undersigned hereby constitute
and appoint JAMES P. GALLAGHER, WILLIAM SONG and JOSHUA L. TARGOFF and each of
them severally, as the true and lawful attorneys and agents of each of the
undersigned, with power to act with or without the others and with full power of
substitution and resubstitution, to execute in the name, place and stead of each
of the undersigned any statements, reports or filings with respect to the
undersigned (whether such filing includes one or more or all of the undersigned)
necessary or advisable in connection with any disclosure requirement promulgated
under the federal or state securities laws of the United States or any other
applicable regulatory body, including, without limitation, the Company's
compliance with the Securities Exchange Act of 1934, as amended, and the rules
and regulations promulgated thereunder (including, without limitation, any
filings on Schedule 13D, Schedule 13G, Form 3, Form 4, Form 5 and Form 13F and
any forms or statements required to be submitted in connection with any
electronic filing), and any and all amendments to such statements, reports and
filings, and any disclosure requirement promulgated under the securities laws or
any similar laws or regulations of any jurisdiction whether inside or outside of
the United States, and all amendments to such statements, reports and filings,
and to file the same, with all exhibits thereto, and all other documents in
connection therewith, with the United States Securities and Exchange Commission
or any other applicable regulatory body, said attorneys and agents having full
power and authority to do and perform in the name and on behalf of any of the
undersigned every act necessary to be done in the premises as fully and as
effectually as the undersigned might or could do in person; and each of the
undersigned hereby ratifies and confirms all that said attorneys and agents
shall do or cause to be done by virtue hereof.

        IN WITNESS WHEREOF, the undersigned has subscribed these presents as of
February 9, 2011.

                            /s/ Daniel S. Loeb
                            ----------------------------
                            Daniel S. Loeb

                            THIRD POINT LLC

                            By: /s/ Daniel S. Loeb
                            ----------------------------
                            Name:   Daniel S. Loeb
                            Title: Chief Executive Officer

                            THIRD POINT PARTNERS LP
                            By:   Third Point Advisors LLC, its General Partner

                            By: /s/ Daniel S. Loeb
                            ----------------------------
                            Name:   Daniel S. Loeb
                            Title: Managing Member

                            THIRD POINT PARTNERS QUALIFIED LP
                            By: Third Point Advisors LLC, its General Partner

                            By: /s/ Daniel S. Loeb
                            ----------------------------
                            Name:   Daniel S. Loeb
                            Title: Managing Member

                            THIRD POINT ULTRA MASTER FUND L.P.
                            By: Third Point Advisors II L.L.C., its General
                            Partner

                            By: /s/ Daniel S. Loeb
                            ----------------------------
                            Name:   Daniel S. Loeb
                            Title: Chief Executive Officer

                            LYXOR/THIRD POINT FUND LIMITED
                            By: Third Point LLC, its Trading Advisor

                            By: /s/ Daniel S. Loeb
                            ----------------------------
                            Name:   Daniel S. Loeb
                            Title: Chief Executive Officer

                            dbX-RISK ARBITRAGE 11 FUND
                            By: Third Point LLC, its Trading Advisor

                            By: /s/ Daniel S. Loeb
                            ----------------------------
                            Name:   Daniel S. Loeb
                            Title: Chief Executive Officer

                            THIRD POINT OFFSHORE MASTER FUND, L.P.
                            By: Third Point Advisors II L.L.C.,
                             its General Partner

                            By: /s/ Daniel S. Loeb
                            ----------------------------
                            Name:   Daniel S. Loeb
                            Title: Managing Director

                            THIRD POINT ADVISORS II L.L.C.

                            By: /s/ Daniel S. Loeb
                            -----------------------------------
                            Name:   Daniel S. Loeb
                            Title: Managing Member