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EXHIBIT 24
POWERS OF ATTORNEY
     Each person whose signature appears below hereby authorizes Richard W. Parod, as attorney-in-fact, to sign on his behalf, individually and in each capacity stated below, the Registration Statement on Form S-8 for the Company’s Employment Agreement with Richard W. Parod and any post-effective amendments thereto, and to file the same, with all exhibits thereto, and all documents in connection therewith, with the Securities and Exchange Commission.
         
Signature   Title   Date
 
       
/s/ David B. Downing
 
David B. Downing
  Chief Financial Officer, Treasurer, Secretary, Vice President-Finance   December 4, 2006
 
       
/s/ Tim J. Paymal
 
Tim J. Paymal
  Corporate Controller   December 7, 2006
 
       
 
  Director     
 
Howard G. Buffett
       
 
       
/s/ Michael N. Christodolou
 
Michael N. Christodolou
  Director and Chairman of the Board   November 3, 2006
 
       
/s/ Larry H. Cunningham
 
Larry H. Cunningham
  Director   December 4, 2006
 
       
/s/ William F. Welsh II
 
William F. Welsh II
  Director   October 29, 2006
 
       
/s/ J. David McIntosh
 
J. David McIntosh
  Director   October 28, 2006
 
       
/s/ Michael C. Nahl
 
Michael C. Nahl
  Director   December 4, 2006