Movie theater giant AMC Entertainment Holdings (NYSE:AMC) could show the benefits from a rebounding box office when the company reports third-quarter financial results Wednesday after market close.Here are the earnings estimates and key items to watch in the earnings report and conference call.Earnings Estimates: Analysts expect AMC Entertainment to report third-quarter revenue of $1.23 billion, down from$1.35 billion in last year's third quarter, according to data from Benzinga Pro.The company has beaten ...