Asset Disposal And Impairments And Assets Held For Sale (Net Gains And (Losses) On Asset Disposal) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011		Jun. 30, 2010
Net Gains and (Losses) on Asset Disposal	$ 3,213	$ 8	$ 12,492		$ 146
Construction And Installation [Member]
Net Gains and (Losses) on Asset Disposal	3,561	(9)	12,852	[1]	129
Other Offshore Services [Member]
Net Gains and (Losses) on Asset Disposal	(236)	17	(248)		17
Corporate [Member]
Net Gains and (Losses) on Asset Disposal	$ (112)	$ 0	$ (112)		$ 0

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