Denny's said Monday that it's being acquired by a group on investors in a deal that will take the breakfast chain private. Denny's board unanimously approved the deal, which values Denny's at $620 million including debt. Denny's will be purchased by private equity investment company TriArtisan Capital Advisors, investment firm Treville Capital and Yadav Enterprises, which is one of Denny's largest franchisees. Under the agreement, Denny's shareholders will receive$6.25 per share in cash for each share o ...