Asset Disposal And Impairments And Assets Held For Sale (Net Gains And (Losses) On Asset Disposal) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011		Sep. 30, 2010
Asset Disposal and Impairments and Assets Held for Sale [Line Items]
Net Gains and (Losses) on Asset Disposal	$ 28	$ 23,819	$ 12,520		$ 23,965
Construction And Installation [Member]
Asset Disposal and Impairments and Assets Held for Sale [Line Items]
Net Gains and (Losses) on Asset Disposal		12,183	12,852	[1]	12,312
Other Offshore Services [Member]
Asset Disposal and Impairments and Assets Held for Sale [Line Items]
Net Gains and (Losses) on Asset Disposal	28	11,636	(220)		11,653
Corporate [Member]
Asset Disposal and Impairments and Assets Held for Sale [Line Items]
Net Gains and (Losses) on Asset Disposal			$ (112)

[1] Proceeds from the sale of a derrick lay barge ("DLB") were received in 2010 and formal transfer of title occurred in 2011.