Subsequent Events	12 Months Ended
Dec. 31, 2011
Subsequent Events
Subsequent Events	21. Subsequent Events (Unaudited) Interests in Gulf of Mexico Crude Oil Pipelines On January 3, 2012, we acquired from Marathon Oil Company interests in several Gulf of Mexico crude oil pipeline systems, including its 28% interest in the Poseidon pipeline system, its 29% interest in the Odyssey pipeline system, and its 23% interest in the Eugene Island pipeline system. The purchase price was $205.9 million, including crude oil linefill of approximately $26 million (net to us), subject to post-closing adjustments. We funded the purchase price with cash available under our credit facility. The acquisition is intended to complement our existing infrastructure in the Gulf of Mexico and enhances our ability to provide capacity and market optionality to producers for their existing and future developments as well as our refining customers onshore in Texas and Louisiana. 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 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. Senior Unsecured Notes Issuance On February 1, 2012, we issued an additional $100 million of aggregate principal amount of senior unsecured notes under our existing 7.875% senior unsecured notes due 2018 indenture. The notes were issued at 101% of face value at an effective interest rate of 7.682%. The notes will be treated as a single class with our outstanding notes and have identical terms and conditions as our outstanding notes for all purposes, including, without limitation, waivers, amendments, redemptions and offers to purchase. The notes mature on December 15, 2018. The net proceeds were used to repay borrowings under our credit agreement.

21. Subsequent Events (Unaudited)

Interests in Gulf of Mexico Crude Oil Pipelines

On January 3, 2012, we acquired from Marathon Oil Company interests in several Gulf of Mexico crude oil pipeline systems, including its 28% interest in the Poseidon pipeline system, its 29% interest in the Odyssey pipeline system, and its 23% interest in the Eugene Island pipeline system. The purchase price was $205.9 million, including crude oil linefill of approximately $26 million (net to us), subject to post-closing adjustments. We funded the purchase price with cash available under our credit facility. The acquisition is intended to complement our existing infrastructure in the Gulf of Mexico and enhances our ability to provide capacity and market optionality to producers for their existing and future developments as well as our refining customers onshore in Texas and Louisiana.

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 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.

Senior Unsecured Notes Issuance

On February 1, 2012, we issued an additional $100 million of aggregate principal amount of senior unsecured notes under our existing 7.875% senior unsecured notes due 2018 indenture. The notes were issued at 101% of face value at an effective interest rate of 7.682%. The notes will be treated as a single class with our outstanding notes and have identical terms and conditions as our outstanding notes for all purposes, including, without limitation, waivers, amendments, redemptions and offers to purchase. The notes mature on December 15, 2018. The net proceeds were used to repay borrowings under our credit agreement.