Exhibit 99.4
Joint Filing Agreement
Pursuant to Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned agree that the Statement on Schedule 13D/A to which this exhibit is attached is filed on behalf of each of them in the capacities set forth below.
Dated: July 2, 2010
| KELSO INVESTMENT ASSOCIATES VI, L.P. | |
| By: Kelso GP VI, LLC, its General Partner | |
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| KEP VI, LLC | |
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| KELSO GP VI, LLC | |
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| Frank T. Nickell | |
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| Thomas R. Wall, IV | |
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| George E. Matelich |
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| Frank K. Bynum, Jr. |
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| Philip E. Berney |
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| Frank J. Loverro |
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| James J. Connors, II |
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| Michael B. Goldberg |
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| David I. Wahrhaftig |
* The undersigned, by signing his name hereto, executes this Joint Filing Agreement pursuant to the Power of Attorney executed on behalf of the above-named entities and individuals, filed with the Schedule 13D and incorporated by reference herein.
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| By: | /s/ Rosanna T. Leone |
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| Rosanna T. Leone |
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| Attorney-in-Fact |