Asset Disposal And Impairments And Assets Held For Sale (Losses On Asset Impairments) (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]
Losses on Asset Impairments		$ 548	$ 5,467	$ 11,482
Construction And Installation [Member]
Asset Disposal and Impairments and Assets Held for Sale [Line Items]
Losses on Asset Impairments			5,467	9,127
Other Offshore Services [Member]
Asset Disposal and Impairments and Assets Held for Sale [Line Items]
Losses on Asset Impairments		$ 548		$ 2,355