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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2013
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In April 2013, we sold our Singco and Somargas marine affiliates to our partner in the joint ventures, IM Skaugen. In connection with the sale, we contributed $90 million to the affiliates and we received five vessels and related working capital. Additionally, $42 million of related affiliate guarantees were terminated. See “Note 8. Commercial Commitments” for further information on our affiliate guarantees. On April 30, 2013, we entered into a new five-year, senior unsecured $575 million revolving credit agreement. The new facility replaced our prior facility and its underlying terms and conditions, including restrictive covenants, are substantially similar to our prior facility.