The chairman, CEO and founder of CKx Inc., the media company behind hit show "American Idol," resigned on Friday and said he is considering buying the company.

Robert F.X. Sillerman has stepped down, effective immediately. He will continue to consult for the company and plans to look into the possibility of buying CKx as well. Sillerman wants the board to be able to evaluate its strategic options, the company said.

Sillerman founded CKx and has served as chairman and CEO since it began in 2005. He is also CKx's largest shareholder.