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Restructuring Charges (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Summary of Restructuring charges      
Costs incurred in 2011 $ 11,600 $ 0 $ 14,300
Total expected costs 14,771    
North America Contract Operations [Member]
      
Summary of Restructuring charges      
Costs incurred in 2011 53    
Total expected costs 53    
International Contract Operations [Member]
      
Summary of Restructuring charges      
Costs incurred in 2011 502    
Total expected costs 867    
Aftermarket Services [Member]
      
Summary of Restructuring charges      
Costs incurred in 2011 422    
Total expected costs 482    
Fabrication [Member]
      
Summary of Restructuring charges      
Costs incurred in 2011 1,574    
Total expected costs 2,424    
Other [Member]
      
Summary of Restructuring charges      
Costs incurred in 2011 9,076    
Total expected costs $ 10,945