American Campus Communities Inc filed SEC Form 8-K: Termination of a Material Definitive Agreement, Completion of Acquisition or Disposition of Assets, Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing, Material Modification to Rights of Security Holders, Entry into a Material Definitive Agreement, Changes in Control of Registrant, Leadership Update, Other Events, Financial Statements and Exhibits (Amendment)