Unit Corporation is an oil and natural gas contract drilling company. The Company has operations in the exploration and production and mid-stream areas. The Company operates through three segments: Oil and Natural Gas, Contract Drilling and Mid-Stream. It is primarily engaged in the exploration, development, acquisition, and production of oil and natural gas properties, the land contract drilling of natural gas and oil wells, and the buying, selling, gathering, processing and treating of natural gas. Its Oil and Natural Gas operations are carried out by its subsidiary Unit Petroleum Company. Contract Drilling operations are carried out by its subsidiary Unit Drilling Company. Its drills onshore oil and natural gas wells for its own account, as well as for other oil and natural gas companies. Its Mid-Stream operations are carried out by its subsidiary Superior Pipeline Company, L.L.C. Its mid-stream operations consist of buying, selling, gathering, processing and treating natural gas.