For decades, Denny’s was the iconic U.S. diner destination — the go-to spot for cheap coffee, late-night meals and highway-side comfort. But that’s all changed in the past few years. While the helpings are still generous, the once-ubiquitous chain has been shrinking as Denny’s struggles with rising menu prices, declining customer traffic and a wave of restaurant closures. Must Read Now Denny’s is being sold to a consortium of private-equity and franchise investors in a $620-million deal that will take t ...