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Restructuring Charges (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Restructuring charges by segment    
Costs incurred $ 6,471 $ 11,594
Total costs incurred 18,065  
Other
    
Restructuring charges by segment    
Costs incurred 3,471 9,043
Total costs incurred 12,514  
North America contract operations | Reportable Segments
    
Restructuring charges by segment    
Costs incurred 813 53
Total costs incurred 866  
International contract operations | Reportable Segments
    
Restructuring charges by segment    
Costs incurred 800 502
Total costs incurred 1,302  
Aftermarket services | Reportable Segments
    
Restructuring charges by segment    
Costs incurred 485 422
Total costs incurred 907  
Fabrication | Reportable Segments
    
Restructuring charges by segment    
Costs incurred 902 1,574
Total costs incurred $ 2,476