Asset Disposal And Impairments And Assets Held For Sale (Losses On Asset Impairments) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Losses on Asset Impairments	$ 5,467	$ 10,222	$ 5,467	$ 10,934
Construction And Installation [Member]
Losses on Asset Impairments	5,467	9,127	5,467	9,127
Other Offshore Services [Member]
Losses on Asset Impairments	$ 0	$ 1,095	$ 0	$ 1,807