Atlas Energy LP formerly known as Atlas Pipeline Holdings, L.P. is a publicly-traded Delaware limited partnership, which was formed in December 2005. It manages the operations and activities of the Partnership and owes a fiduciary duty to the Partnership's common unitholders. It is a publicly-traded Delaware limited partnership formed in 1999, which provides natural gas gathering services in the Anadarko, Arkoma and Permian Basins and the Golden Trend in the southwestern and mid-continent United States and the Appalachian Basin in the eastern United States. In addition, it is a provider of natural gas processing and treatment services in Oklahoma and Texas. It also provides interstate gas transmission services in southeastern Oklahoma, Arkansas, southern Kansas and southeastern Missouri. Its business is conducted in the midstream segment of the natural gas industry through two segments: its Mid-Continent operations and its Appalachian operations. In It's Mid-Continent service area, it competes for the acquisition of well connections with several other gathering/servicing operations. These operations include plants and gathering systems operated by ONEOK Field Services, Carrerra Gas Company, Copano Energy, LLC, Enogex, LLC, Eagle Rock Midstream Resources, L.P., Enbridge, Inc., Hiland Partners, MarkWest Energy Partners, L.P., Mustang Fuel Corporation, DCP Midstream, J.L. Davis and Targa Resources. The operation of pipelines, plant and other facilities for gathering, compressing, treating, processing, or transporting natural gas, natural gas liquids and other products is subject to stringent and complex laws and regulations pertaining to health, safety and the environment.