Segment Information (Schedule Of Assets By Reportable Segments) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Consolidated segment assets	$ 1,305,889	$ 1,343,741
Construction And Installation [Member]
Consolidated segment assets	865,660	780,786
Other Offshore Services [Member]
Consolidated segment assets	106,907	113,129
Corporate [Member]
Consolidated segment assets	$ 333,322	$ 449,826