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Kommandor LLC (Details) (USD $)	12 Months Ended
Kommandor LLC (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Noncontrolling Interest [Line Items]
Oil and gas processing equipment, percentage of cost	100.00%
Property and equipment	$ 2,051,796,000	$ 1,815,012,000
Noncontrolling Interest, Ownership Percentage by Parent	81.00%
Working interest	70.00%
Estimated cash outlay	19,000,000
Conversion Of The Vessel [Member]
Noncontrolling Interest [Line Items]
Property and equipment	148,700,000
Topside Oil And Gas Processing Facilities [Member]
Noncontrolling Interest [Line Items]
Property and equipment	$ 196,300,000

Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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