Plum Creek Timber Co Inc was incorporated in Delaware. It is a real estate investment trust. The Company owned approximately 6.6 million acres of timberlands located in 19 states. It manages its timberlands in two business segments: the Northern Resources Segment, consisting of timberlands in Maine, Michigan, Montana, New Hampshire, Oregon, Vermont, Washington, West Virginia and Wisconsin; and the Southern Resources Segment, consisting of timberlands in Alabama, Arkansas, Florida, Georgia, Louisiana, Mississippi, North Carolina, South Carolina, Texas, and Virginia. In addition, its Energy and Natural Resources Segment includes its natural resource businesses that focus on opportunities for oil and natural gas production, construction aggregates and mineral extraction, wind power and communication and transportation rights of way. The Company's real estate segment includes development of certain properties, internally and through joint venture arrangements. The Company's manufacturing segment, also conducted through its wholly-owned taxable REIT subsidiaries, includes two lumber mills, two plywood mills and two medium density fiberboard ("MDF") production lines in Montana and one lumber remanufacturing facility in Idaho. Some of its real estate activities, including its real estate development business, are conducted through its wholly-owned taxable REIT subsidiaries. As of December 31, 2014, the Northern Resources Segment encompassed approximately 3.1 million acres of timberlands and the Southern Resources Segment consisted of approximately 3.6 million acres of timberlands. In its Real Estate Segment, the Company competes with numerous sellers of entitled and unentitled land in hundreds of local markets. The Company's operations are subject to federal, state and local environmental laws and regulations, including laws relating to water, air, solid waste and hazardous substances and the requirements of the Federal Occupational Safety and Health Act and comparable state statutes relating to the health and safety of its employees.