Hornbeck Offshore Services, Inc., through its subsidiaries, provides marine transportation services to exploration and production, oilfield service, offshore construction, and the United States military customers. The company operates in two segments, Upstream and Downstream. The Upstream segment owns and operates fleets of the U.S.-flagged new generation offshore support vessels (OSVs) that support deepwater and ultra-deepwater exploration, development, production, construction, installation, maintenance, repair, and enhanced oil recovery requirements of the offshore oil and gas industry in the United States Gulf of Mexico, other U.S. coastlines, Latin America, and the Middle East. This segment also owns work class ROVs, multi-purpose support vessels (MPSVs), and a shore-base facility located in Port Fourchon, Louisiana. In addition, the Upstream segment provides vessel management services for other vessels owners, such as crewing, daily operational management, and maintenance. The Downstream segment owns and operates a fleet of ocean-going tugs and double-hulled tank barges that transport petroleum products, primarily in the northeastern United States, the Gulf of Mexico, the Great Lakes, and Puerto Rico. This segment’s tugs and tank barges provide coastwise transportation of refined and bunker grade petroleum products, as well as downstream services, such as support of deepwater well testing, and other specialty applications. As of December 31, 2011, Hornbeck Offshore Services, Inc. owned and operated 46 active new generation OSVs and 4 MPSVs; and 9 double-hulled tank barges, as well as 15 ocean-going tugs, of which 6 were stacked and being marketed for sale. The company was founded in 1997 and is headquartered in Covington, Louisiana.