Business Segment Information (Schedule Of Segment Reporting Information By Segment) (Details) (USD $)	3 Months Ended					9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Mar. 31, 2010	Sep. 30, 2011		Sep. 30, 2010
Revenues	$ 372,496,000		$ 392,669,000			$ 1,002,422,000		$ 893,501,000
Income (loss) from operations	100,213,000		60,098,000			228,742,000		(65,196,000)
Settlement of a third party claim					13,800,000			13,800,000
Settlement of claims					17,500,000			17,500,000
Equity in earnings of equity investments (Note 6)	4,906,000		6,221,000			16,443,000		12,932,000
Contracting Services [Member]
Revenues	229,967,000		238,531,000			532,857,000		595,048,000
Income (loss) from operations	47,363,000		31,015,000			81,194,000		102,282,000
Production Facilities [Member]
Revenues	19,986,000		74,458,000			56,101,000		97,169,000
Income (loss) from operations	10,983,000	[1]	44,520,000	[1]		28,859,000	[1]	57,460,000	[1]
Oil and Gas [Member]
Revenues	159,218,000		95,566,000			500,535,000		288,867,000
Income (loss) from operations	48,622,000		(4,384,000)			144,926,000		(159,991,000)
Corporate [Member]
Income (loss) from operations	(6,227,000)	[2]	(10,767,000)	[2]		(25,780,000)	[2]	(46,242,000)	[2]
Intercompany Elimination [Member]
Revenues	(36,675,000)		(15,886,000)			(87,071,000)		(87,583,000)
Income (loss) from operations	$ (528,000)		$ (286,000)			$ (457,000)		$ (18,705,000)

[1] In April 2009, Kommandor LLC commenced leasing the HP I to us under terms of a charter arrangement following the completion of the initial conversion of the vessel (Note 8 of our 2010 Form10-K). The HP I was certified as a floating oil and gas production unit in June 2010 following the completion of installation of oil and gas processing facilities on the vessel.

[2] The nine-month period ended September 30, 2010, included $13.8 million of $17.5 million settlement of a third party claim against us in March 2010 (Note 14).