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Asset Disposal And Impairments And Assets Held For Sale (Tables)
9 Months Ended
Sep. 30, 2011
Asset Disposal And Impairments And Assets Held For Sale [Abstract] 
Net Gains And (Losses) On Asset Disposal
Losses On Asset Impairments
                                         
            Three Months Ended     Nine Months Ended  
            September 30     September 30  
Segment   Description of Asset     2011     2010     2011     2010  
            (In thousands)  
Construction and Installation
  One OSV and other equipment in 2011 & 2010   $     $     $ 5,467     $ 9,127  
Other Offshore Services
  Two DSVs and other equipment           548             2,355  
 
                               
Total
          $     $ 548     $ 5,467     $ 11,482  
 
                               
Assets Held For Sale
                                 
            September 30             December 31  
Segment   Description of Asset     2011     Description of Asset     2010  
            (In thousands)     (In thousands)  
Construction and Installation
  One OSV and other equipment   $ 1,510     One DLB, one OSV and other equipment   $ 14,469  
Corporate
  None         Airplane     2,250  
 
                           
Total
          $ 1,510             $ 16,719