Parker Drilling Company (Parker Drilling) is a provider of contract drilling, and drilling-related services and rental tools. The Company's business consists of two business lines: drilling services and rental tools services. Its Rental Tools Services business includes its Rental Tools segment, and its Drilling Services business includes its U.S. (Lower 48) Drilling, and International & Alaska Drilling segments. The Company's U.S. (Lower 48) Drilling segment provides drilling services with its Gulf of Mexico barge drilling rig fleet and through U.S. (Lower 48) based O&M services. Its International & Alaska Drilling segment provides drilling services, with Company-owned rigs, as well as through O&M contracts, and project related services. In its Rental Tools Services business, it provides rental equipment and services to exploration and production (E&P) companies, drilling contractors and service companies on land and offshore in the United States and select international markets.