Subsequent Event - Acquisition Of Interests In Gulf Of Mexico Crude Oil Pipeline Systems	9 Months Ended
Sep. 30, 2011
Subsequent Event - Acquisition Of Interests In Gulf Of Mexico Crude Oil Pipeline Systems [Abstract]
Subsequent Event - Acquisition Of Interests In Gulf Of Mexico Crude Oil Pipeline Systems	15. Subsequent Event – Acquisition of Interests in Gulf of Mexico Crude Oil Pipeline Systems On October 28, 2011, we entered into definitive agreements to acquire from Marathon Oil Company, for $205.76 million, interests in several Gulf of Mexico crude oil pipeline systems, including its 28% interest in Poseidon Oil Pipeline Company, L.L.C., its 29% interest in Odyssey Pipeline L.L.C., and its 23% interest in the Eugene Island Pipeline System. The Poseidon system is comprised of a 367-mile network of crude oil pipelines, varying in diameter from 16 to 24 inches, with capacity to deliver approximately 400,000 barrels per day of crude oil from developments in the central and western offshore Gulf of Mexico to other pipelines and terminals onshore and offshore Louisiana. The Odyssey system is comprised of a 120-mile network of crude oil pipelines, varying in diameter from 12 to 20 inches, with capacity to deliver up to 300,000 barrels per day of crude oil from developments in the eastern Gulf of Mexico to other pipelines and terminals onshore Louisiana. The Eugene Island Pipeline System is comprised of a 183-mile network of crude oil pipelines, the main pipeline of which is 20 inches in diameter, with capacity to deliver approximately 200,000 barrels per day of crude oil from developments in the central Gulf of Mexico to other pipelines and terminals onshore Louisiana. The Poseidon and Odyssey interests are subject to the expiration or waiver of rights of first refusal, and we are not obligated to consummate any transaction unless we are ultimately successful in acquiring the interest in Poseidon. Additionally, Marathon Oil has the right to dispose of certain of the other oil pipeline assets prior to any final closing of a transaction with us. The purchase consideration is subject to usual and customary adjustments (e.g., for debt, working capital, etc.) and includes an estimated $29 million valuation of crude oil line fill at current market prices owned by the interests to be acquired. We expect to finance that acquisition with funds available under our revolving credit facility. Subject to the satisfaction or waiver of the conditions to closing, we expect to close that transaction in the fourth quarter of 2011.

Subsequent Event - Acquisition Of Interests In Gulf Of Mexico Crude Oil Pipeline Systems

9 Months Ended

Sep. 30, 2011

Subsequent Event - Acquisition Of Interests In Gulf Of Mexico Crude Oil Pipeline Systems [Abstract]

Subsequent Event - Acquisition Of Interests In Gulf Of Mexico Crude Oil Pipeline Systems

15. Subsequent Event – Acquisition of Interests in Gulf of Mexico Crude Oil Pipeline Systems

On October 28, 2011, we entered into definitive agreements to acquire from Marathon Oil Company, for $205.76 million, interests in several Gulf of Mexico crude oil pipeline systems, including its 28% interest in Poseidon Oil Pipeline Company, L.L.C., its 29% interest in Odyssey Pipeline L.L.C., and its 23% interest in the Eugene Island Pipeline System. The Poseidon system is comprised of a 367-mile network of crude oil pipelines, varying in diameter from 16 to 24 inches, with capacity to deliver approximately 400,000 barrels per day of crude oil from developments in the central and western offshore Gulf of Mexico to other pipelines and terminals onshore and offshore Louisiana. The Odyssey system is comprised of a 120-mile network of crude oil pipelines, varying in diameter from 12 to 20 inches, with capacity to deliver up to 300,000 barrels per day of crude oil from developments in the eastern Gulf of Mexico to other pipelines and terminals onshore Louisiana. The Eugene Island Pipeline System is comprised of a 183-mile network of crude oil pipelines, the main pipeline of which is 20 inches in diameter, with capacity to deliver approximately 200,000 barrels per day of crude oil from developments in the central Gulf of Mexico to other pipelines and terminals onshore Louisiana. The Poseidon and Odyssey interests are subject to the expiration or waiver of rights of first refusal, and we are not obligated to consummate any transaction unless we are ultimately successful in acquiring the interest in Poseidon. Additionally, Marathon Oil has the right to dispose of certain of the other oil pipeline assets prior to any final closing of a transaction with us. The purchase consideration is subject to usual and customary adjustments (e.g., for debt, working capital, etc.) and includes an estimated $29 million valuation of crude oil line fill at current market prices owned by the interests to be acquired. We expect to finance that acquisition with funds available under our revolving credit facility. Subject to the satisfaction or waiver of the conditions to closing, we expect to close that transaction in the fourth quarter of 2011.