SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

SCHEDULE 13G/A

(Rule 13d-102)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO

RULES 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED

PURSUANT TO RULE 13d-2

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

(Name of Issuer)

(Title of Class of Securities)

(CUSIP Number)

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

x Rule 13d-1(b)

x Rule 13d-1(c)

¨ Rule 13d-1(d)

13G/A

13G/A

13G/A

13G/A

13G/A

13G/A

SCHEDULE 13G/A

This Amendment No. 1 to Schedule 13G (this “Amendment”) is being filed on behalf of Highland Crusader Offshore Partners, L.P., a Bermuda limited partnership (the “Crusader Fund”), Highland Crusader Fund GP, L.P., a Delaware limited partnership and general partner of the Crusader Fund (the “Crusader GP”), Highland Crusader GP LLC, a Delaware limited liability company and general partner of the Crusader GP (the “Crusader LLC”), Highland Capital Management, L.P., a Delaware limited partnership (“Highland Capital”), Strand Advisors, Inc., a Delaware corporation (“Strand”), and James D. Dondero (collectively, the “Reporting Persons”). This Amendment modifies the original Schedule 13G filed with the Securities and Exchange Commission on June 15, 2012 (the “Original 13G”) by the Reporting Persons.

James D. Dondero is the President of Strand. Strand is the general partner of Highland Capital. Highland Capital serves as the advisor to the Crusader Fund, among other funds and managed accounts.

Item 4 of the Original 13G is hereby amended and restated to read as follows:

As advisor to the Crusader Fund, Highland Capital and Strand may be deemed the beneficial owners of the 432,750 Common Shares held by the Crusader Fund.

Mr. Dondero may be deemed the beneficial owner of the 432,750 Common Shares held by the Crusader Fund as President of Highland Capital.

Mr. Dondero may be deemed the beneficial owner of 3.4% of the outstanding Common Shares. This percentage was determined by dividing 432,750, the number of Common Shares held directly by the Crusader Fund, by 12,556,673, which is the number of Common Shares outstanding according to the Issuer’s Quarterly Report on Form 10-Q for the quarterly period ended on March 31, 2012 filed with the Securities and Exchange Commission on May 15, 2012.

8 of 11

Item 5 of the Original 13G is hereby amended and restated to read as follows:

If this statement is being filed to report the fact that as of the date hereof the Reporting Persons have ceased to be the beneficial owners of more than five percent of the class of securities, check the following [X].

For the Crusader Fund, the Crusader GP and the Crusader LLC:

By signing below each of the Reporting Persons certifies that, to the best of such person’s knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

For Highland Capital, Strand and Mr. Dondero:

By signing below each of the Reporting Persons certifies that, to the best of such person’s knowledge and belief, the securities referred to above were acquired and held in the ordinary course of business and were not acquired and were not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

9 of 11

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date: June 26, 2012

10 of 11

11 of 11