This excerpt taken from the SD DEF 14A filed Apr 22, 2009.
Director Attendance at Meetings of the Board of Directors and Stockholder Meetings
The Board of Directors held nine meetings during 2008, and each of the directors attended all of those meetings.
Our non-management directors meet in executive session at each regularly scheduled Board of Directors meeting. In the event that the non-management directors include directors who are not independent under the NYSE listing standards, then at least once a year, there should be an executive session including only independent directors. The director who presides at meetings of non-management and independent directors rotates among the non-management directors every regularly scheduled meeting, provided that a nonmanagement director who is not independent shall not preside at a meeting of independent directors.
The Board of Directors encourages interaction with stockholders and recognizes that annual meetings of the stockholders provide a venue where stockholders can access and interact with our directors. Accordingly, while we do not have a policy requiring our directors to attend annual meetings of the stockholders, all of the members of the Board of Directors are encouraged to attend the meetings. All of our directors attended the 2008 annual meeting of the stockholders.