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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Summarizes the valuation of interest rate swaps and impaired assets    
Interest rate swaps asset (liability) $ (19,446) $ (29,025)
Foreign currency derivatives asset (liability)   (462)
Impaired long-lived assets 1,642 70,637
Aftermarket services goodwill 0  
Fabrication goodwill 0  
Quoted Market Prices in Active Markets (Level 1) [Member]
    
Summarizes the valuation of interest rate swaps and impaired assets    
Interest rate swaps asset (liability) 0 0
Foreign currency derivatives asset (liability)   0
Impaired long-lived assets 0 0
Aftermarket services goodwill 0  
Fabrication goodwill 0  
Significant Other Observable Inputs (level 2) [Member]
    
Summarizes the valuation of interest rate swaps and impaired assets    
Interest rate swaps asset (liability) (19,446) (29,025)
Foreign currency derivatives asset (liability)   (462)
Impaired long-lived assets 0 0
Aftermarket services goodwill 0  
Fabrication goodwill 0  
Significant Unobservable Inputs (Level 3) [Member]
    
Summarizes the valuation of interest rate swaps and impaired assets    
Interest rate swaps asset (liability) 0 0
Foreign currency derivatives asset (liability)   0
Impaired long-lived assets 1,642 70,637
Aftermarket services goodwill 0  
Fabrication goodwill $ 0