Horizon Lines, Inc. operates as a holding company for Horizon Lines, LLC (Horizon Lines) and wholly owned subsidiaries, Horizon Logistics Holdings, LLC (Horizon Logistics), Hawaii Stevedores, Inc. (HSI) and Horizon Lines of Puerto Rico, Inc. (HLPR). The Company’s services are classified into two businesses: Horizon Lines and Horizon Logistics. Horizon Lines operates as a Jones Act container shipping business with primary service to ports within the continental United States, Puerto Rico, Alaska, Hawaii and Guam. Horizon Lines also offers terminal services. Horizon Logistics manages integrated logistics service offerings, including rail, trucking, warehousing, distribution and non-vessel operating common carrier (NVOCC) services. HLPR operates as an agent for Horizon Lines in Puerto Rico and also provides terminal services in Puerto Rico.