Nabors is one of the largest drilling contractors in the world. Nabors Offshore owns and operates more than 600 land drilling and 970 land workover and well-servicing rigs throughout the world. Offshore, the company operates 44 platforms, 17 jack-ups, and three barge rigs in the domestic and international markets. It markets more than 30 marine transportation and support vessels, primarily in the Gulf of Mexico. In addition, the company manufactures top drives and drilling instrumentation systems and provides comprehensive oilfield hauling, engineering, civil construction, logistics and facilities maintenance and project management services. The company participates in most of the significant oil, gas and geothermal markets in the world. Nabors was founded in 1987 and is headquartered in Houston.