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Kommandor LLC (Details) (USD $)	1 Months Ended	12 Months Ended
Kommandor LLC (Details) (USD $)	Apr. 30, 2009	Dec. 31, 2011	Dec. 31, 2010
Noncontrolling Interest [Line Items]
Oil and gas processing equipment, percentage of cost	100.00%
Property and equipment		$ 4,391,064,000	$ 4,486,077,000
Estimated cash outlay		19,000,000
Kommandor LLC [Member]
Noncontrolling Interest [Line Items]
Working interest percentage		81.00%
Phoenix Field [Member]
Noncontrolling Interest [Line Items]
Working interest	70.00%
Conversion Of The Vessel [Member] \| Kommandor LLC [Member]
Noncontrolling Interest [Line Items]
Property and equipment		148,700,000
Topside Oil And Gas Processing Facilities [Member] \| Kommandor LLC [Member]
Noncontrolling Interest [Line Items]
Property and equipment		$ 196,200,000

Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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